Dell Precision Rack 7910 User manual

Dell Precision Rack 7910
Owner's Manual
Regulatory Model: E31S
Regulatory Type: E31S001
August 2021
Rev. A04

Chapter 1: Working on your computer............................................................................................7
Turning Off Your Computer.............................................................................................................................................. 7
Chapter 2: LCD panel features...................................................................................................... 8
Home screen......................................................................................................................................................................... 8
Setup menu........................................................................................................................................................................... 9
View menu............................................................................................................................................................................. 9
Documentation matrix........................................................................................................................................................ 9
Chapter 3: Hard drive indicator codes.......................................................................................... 11
Chapter 4: Installing and removing system components............................................................... 12
Safety instructions.............................................................................................................................................................12
Before working inside your system................................................................................................................................ 12
After working inside your system...................................................................................................................................12
Recommended tools..........................................................................................................................................................12
System Overview............................................................................................................................................................... 13
Front bezel (optional)....................................................................................................................................................... 15
Removing the front bezel...........................................................................................................................................15
Installing the front bezel.............................................................................................................................................15
Removing the system cover............................................................................................................................................16
Installing the system cover.............................................................................................................................................. 16
Inside the system............................................................................................................................................................... 17
Cooling shroud.................................................................................................................................................................... 19
Removing the cooling shroud....................................................................................................................................19
Installing the cooling shroud...................................................................................................................................... 19
System memory................................................................................................................................................................. 20
General memory module installation guidelines..........................................................................................................22
Sample memory configurations......................................................................................................................................22
Removing memory modules............................................................................................................................................ 24
Installing memory modules.............................................................................................................................................. 26
Hard drives.......................................................................................................................................................................... 27
Removing a 2.5 inch hard-drive blank..........................................................................................................................28
Installing a 2.5 inch hard-drive blank............................................................................................................................ 28
Removing Hard Drive....................................................................................................................................................... 29
Installing Hard Drive..........................................................................................................................................................30
Removing a hard drive from a hard-drive carrier...................................................................................................... 30
Installing a hard drive into a hard-drive carrier...........................................................................................................31
Optical drive (optional).....................................................................................................................................................31
Removing the optical drive........................................................................................................................................ 31
Installing the optical drive..........................................................................................................................................32
Cooling fans........................................................................................................................................................................ 33
Removing a cooling fan....................................................................................................................................................33
Installing a cooling fan......................................................................................................................................................34
Contents
2 Contents

Removing the cooling-fan assembly............................................................................................................................. 34
Installing the cooling-fan assembly............................................................................................................................... 36
Internal USB memory key (optional)............................................................................................................................ 36
Replacing the internal USB key......................................................................................................................................36
PCIe card holder................................................................................................................................................................ 37
Removing the PCIe card holder............................................................................................................................... 37
Installing the PCIe card holder................................................................................................................................. 38
Opening and closing the PCIe card holder latch..................................................................................................39
Cable retention bracket................................................................................................................................................... 40
Removing the cable retention bracket................................................................................................................... 40
Installing the cable retention bracket..................................................................................................................... 40
Expansion cards and expansion card risers................................................................................................................. 41
Expansion card installation guidelines..................................................................................................................... 41
Removing an expansion card from expansion-card riser 2 or 3....................................................................... 42
Installing an expansion card into the expansion-card riser 2 or 3....................................................................43
Removing an expansion card from the expansion-card riser 1......................................................................... 44
Installing an expansion card into the expansion-card riser 1.............................................................................45
Removing the riser 1 blank........................................................................................................................................ 46
Installing the riser 1 blank...........................................................................................................................................47
Removing expansion-card risers.............................................................................................................................. 47
Installing expansion-card risers.................................................................................................................................51
GPU card installation guidelines............................................................................................................................... 51
Installing a GPU card.................................................................................................................................................. 52
Removing a GPU card................................................................................................................................................ 52
SD vFlash media card (optional)................................................................................................................................... 53
Replacing an SD vFlash media card........................................................................................................................ 53
Internal dual SD module (optional)................................................................................................................................54
Removing an internal SD card.................................................................................................................................. 54
Installing an internal SD card.................................................................................................................................... 55
Removing the internal dual SD module .................................................................................................................55
Installing the internal dual SD module ................................................................................................................... 57
Integrated storage controller card................................................................................................................................ 58
Removing the integrated storage controller card............................................................................................... 58
Installing the integrated storage controller card................................................................................................. 59
Network daughter card................................................................................................................................................... 60
Removing the network daughter card .................................................................................................................. 60
Installing the network daughter card......................................................................................................................62
Heat sink and processor.................................................................................................................................................. 62
Removing a processor................................................................................................................................................62
Installing a processor..................................................................................................................................................65
Power supply units............................................................................................................................................................66
Hot spare feature.............................................................................................................................................................. 67
Removing the power supply unit blank........................................................................................................................ 67
Installing the power supply unit blank.......................................................................................................................... 68
Removing an AC power supply unit.............................................................................................................................. 68
Installing an AC power supply unit................................................................................................................................ 69
System battery...................................................................................................................................................................70
Replacing the system battery...................................................................................................................................70
Hard-drive backplane........................................................................................................................................................72
Removing the hard-drive backplane ............................................................................................................................72
Contents 3

Installing the hard-drive backplane .............................................................................................................................. 74
Control panel assembly.................................................................................................................................................... 75
Removing the control panel .....................................................................................................................................75
Installing the control panel ....................................................................................................................................... 77
System board......................................................................................................................................................................78
Removing the system board..................................................................................................................................... 78
Installing the system board....................................................................................................................................... 80
Entering the system service tag by using System Setup...................................................................................81
Restoring the Service Tag by using the Easy Restore feature......................................................................... 81
Updating the BIOS version........................................................................................................................................ 81
Re-enabling the TPM for TXT users.......................................................................................................................82
Chapter 5: Troubleshooting your system..................................................................................... 83
Troubleshooting system startup failure....................................................................................................................... 83
Troubleshooting external connections......................................................................................................................... 83
Troubleshooting the video subsystem......................................................................................................................... 83
Troubleshooting a USB device....................................................................................................................................... 83
Troubleshooting iDRAC Direct (USB XML configuration)...................................................................................... 84
Troubleshooting iDRAC Direct (laptop connection)................................................................................................. 84
Troubleshooting a serial I/O device.............................................................................................................................. 84
Troubleshooting a NIC..................................................................................................................................................... 85
Troubleshooting a wet system.......................................................................................................................................85
Troubleshooting a damaged system............................................................................................................................. 86
Troubleshooting the system battery............................................................................................................................ 86
Troubleshooting power supply units............................................................................................................................. 87
Power source problems..............................................................................................................................................87
Power supply unit problems...................................................................................................................................... 87
Troubleshooting cooling problems.................................................................................................................................87
Troubleshooting cooling fans......................................................................................................................................... 88
Troubleshooting system memory.................................................................................................................................. 88
Troubleshooting an internal USB key........................................................................................................................... 89
Troubleshooting an SD card........................................................................................................................................... 89
Troubleshooting an optical drive................................................................................................................................... 90
Troubleshooting a hard drive..........................................................................................................................................90
Troubleshooting a storage controller............................................................................................................................ 91
Troubleshooting expansion cards...................................................................................................................................91
Troubleshooting processors........................................................................................................................................... 92
Error Messages..................................................................................................................................................................92
System messages..............................................................................................................................................................93
Warning messages...................................................................................................................................................... 93
Diagnostic messages.................................................................................................................................................. 93
Alert messages.............................................................................................................................................................93
Chapter 6: Using system diagnostics...........................................................................................94
Dell Embedded System Diagnostics..............................................................................................................................94
When to use the Embedded System Diagnostics................................................................................................94
Running the Embedded System Diagnostics from Boot Manager.................................................................. 94
Running the Embedded System Diagnostics from the Dell Lifecycle Controller......................................... 94
System diagnostics controls..................................................................................................................................... 94
4Contents

Chapter 7: Jumpers and connectors............................................................................................ 96
System board jumper settings....................................................................................................................................... 96
System board connectors............................................................................................................................................... 96
Disabling a forgotten password..................................................................................................................................... 98
Chapter 8: Specifications............................................................................................................99
Chapter 9: System Setup........................................................................................................... 104
Boot Menu.........................................................................................................................................................................104
Timing Key Sequences................................................................................................................................................... 104
Dell Diagnostics................................................................................................................................................................ 104
About system setup........................................................................................................................................................ 105
Entering System Setup............................................................................................................................................ 105
System Setup Main Menu....................................................................................................................................... 105
System BIOS screen................................................................................................................................................. 105
System Information screen details........................................................................................................................ 106
Memory Settings screen details............................................................................................................................. 107
Processor Settings screen details......................................................................................................................... 107
SATA Settings screen details................................................................................................................................. 109
Boot Settings screen details.....................................................................................................................................111
Integrated Devices screen details........................................................................................................................... 111
Serial Communication screen details..................................................................................................................... 113
System Profile Settings screen details..................................................................................................................113
System Security settings screen details...............................................................................................................115
Miscellaneous Settings screen details...................................................................................................................116
Chapter 10: NIC indicator codes................................................................................................. 118
Chapter 11: Power indicator codes.............................................................................................. 119
Chapter 12: Contacting Dell........................................................................................................ 121
Contacting Dell..................................................................................................................................................................121
Quick Resource Locator (QRL).....................................................................................................................................121
Contents 5

Notes, cautions, and warnings
NOTE: A NOTE indicates important information that helps you make better use of your computer.
CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid
the problem.
WARNING: A WARNING indicates a potential for property damage, personal injury, or death.
© 2016 Dell Inc. All rights reserved. This product is protected by U.S. and international copyright and intellectual property laws. Dell and
the Dell logo are trademarks of Dell Inc. in the United States and/or other jurisdictions. All other marks and names mentioned herein may be
trademarks of their respective companies.

Working on your computer
Turning Off Your Computer
About this task
CAUTION: To avoid losing data, save and close all open files and exit all open programs before you turn off your
computer.
Steps
1. Shut down the operating system:
●In Windows 8:
○Using a touch-enabled device:
a. Swipe in from the right edge of the screen, opening the Charms menu and select Settings.
b. Select the and then select Shut down
○Using a mouse:
a. Point to upper-right corner of the screen and click Settings.
b. Click the and select Shut down.
●In Windows 7:
a. Click Start .
b. Click Shut Down.
2. Ensure that the computer and all attached devices are turned off. If your computer and attached devices did not
automatically turn off when you shut down your operating system, press and hold the power button for about 6 seconds to
turn them off.
1
Working on your computer 7

LCD panel features
NOTE: The LCD panel is present only on Precision Rack 7910
The LCD panel of your system provides system information and status and error messages to indicate if the system is operating
correctly or if the system needs attention. For more information on error messages, see the Dell Event and Error Messages
Reference Guide at dell.com/esmmanuals.
●The LCD backlight lights blue during normal operating conditions and lights amber to indicate an error condition.
●The LCD backlight is off when the system is in standby mode and can be turned on by pressing either the Select, Left, or
Right button on the LCD panel.
●The LCD backlight remains off if LCD messaging is turned off through the iDRAC utility, the LCD panel, or other tools.
Figure 1. LCD panel features
Table 1. LCD panel features
Item Button Description
1 Left Moves the cursor back in one-step increments.
2 Select Selects the menu item highlighted by the cursor.
3 Right Moves the cursor forward in one-step increments.
During message scrolling:
●Press and hold the button to increase scrolling speed.
●Release the button to stop.
NOTE: The display will stop scrolling when the button is released. After 45
seconds of inactivity the display will start scrolling.
Home screen
The Home screen displays user-configurable information about the system. This screen is displayed during normal system
operation when there are no status messages or errors. When the system is in standby mode, the LCD backlight turns off after
five minutes of inactivity if there are no error messages. Press one of the three navigation buttons (Select, Left, or Right) to
view the Home screen.
To navigate to the Home screen from another menu, continue to select the up arrow until the Home icon is displayed,
and then select the Home icon.
From the Home screen, press the Select button to enter the main menu.
2
8 LCD panel features

Setup menu
NOTE: When you select an option in the Setup menu, you must confirm the option before proceeding to the next action.
Option Description
iDRAC Select DHCP or Static IP to configure the network mode. If Static IP is selected, the available fields
are IP, Subnet (Sub), and Gateway (Gtw). Select Setup DNS to enable DNS and to view domain
addresses. Two separate DNS entries are available.
Set error Select SEL to view LCD error messages in a format that matches the IPMI description in the SEL. This is
useful when trying to match an LCD message with an SEL entry.
Select Simple to view LCD error messages in a simplified user-friendly description. For more
information about error messages, see the Dell Event and Error Messages Reference Guide at Dell.com/
openmanagemanuals > OpenManage software.
Set home Select the default information to be displayed on the Home screen. See View menu for the options and
option items that can be set as the default on the Home screen.
View menu
NOTE: When you select an option in the View menu, you must confirm the option before proceeding to the next action.
Option Description
iDRAC IP Displays the IPv4 or IPv6 addresses for iDRAC8. Addresses include DNS (Primary and Secondary),
Gateway, IP, and Subnet (IPv6 does not have Subnet).
MAC Displays the MAC addresses for iDRAC, iSCSI, or Network devices.
Name Displays the name of the Host, Model, or User String for the system.
Number Displays the Asset tag or the Service tag for the system.
Power Displays the power output of the system in BTU/hr or Watts. The display format can be configured in the
Set home submenu of the Setup menu.
Temperature Displays the temperature of the system in Celsius or Fahrenheit. The display format can be configured in
the Set home submenu of the Setup menu.
Documentation matrix
Table 2. Documentation matrix
To... Refer to...
Install your system into a rack Rack documentation included with your rack solution
Set up your system and know the system technical
specifications
Getting Started With Your System that shipped with your
system or see dell.com/poweredgemanuals
Install the operating system Operating system documentation at dell.com/
operatingsystemmanuals
Get an overview of the Dell Systems Management offerings Dell OpenManage Systems Management Overview Guide at
dell.com/openmanagemanuals
Configure and log in to iDRAC, set up managed and
management system, know the iDRAC features and
troubleshoot using iDRAC
Integrated Dell Remote Access Controller User's Guide at
dell.com/esmmanuals
Know about the RACADM subcommands and supported
RACADM interfaces
RACADM Command Line Reference Guide for iDRAC and
CMC at dell.com/esmmanuals
LCD panel features 9

Table 2. Documentation matrix (continued)
To... Refer to...
Launch, enable and disable Lifecycle Controller, know the
features, use and troubleshoot Lifecycle Controller
Dell Lifecycle Controller User’s Guide at dell.com/
esmmanuals
Use Lifecycle Controller Remote Services Dell Lifecycle Controller Remote Services Quick Start Guide at
dell.com/esmmanuals
Set up, use, and troubleshoot OpenManage Server
Administrator
Dell OpenManage Server Administrator User’s Guide at
dell.com/openmanagemanuals
Install, use and troubleshoot OpenManage Essentials Dell OpenManage Essentials User’s Guide at dell.com/
openmanagemanuals
Know the features of the storage controller cards, deploy the
cards, and manage the storage subsystem
Storage controller documentation at dell.com/
storagecontrollermanuals
Check the event and error messages generated by the system
firmware and agents that monitor system components
Dell Event and Error Messages Reference Guide at dell.com/
esmmanuals
Know about Alert messages Dell OpenManage Systems Management Overview Guide at
dell.com/openmanagemanuals
Know about iDRAC 8 User’s Manual http://www.dell.com/support/home/us/en/19/product-
support/product/integrated-dell-remote-access-cntrllr-8-
with-lifecycle-controller-v2.00.00.00/manuals
10 LCD panel features

Hard drive indicator codes
Figure 2. Hard drive indicators
1. hard drive activity indicator
2. hard drive status indicator
3. hard drive
NOTE: If the hard drive is in Advanced Host Controller Interface (AHCI) mode, the status indicator (on the right side) does
not function and remains off.
Table 3. Hard drive indicator codes
Drive-status indicator pattern (RAID only) Condition
Blinks green two times per second Identifying drive or preparing for removal.
Off Drive ready for insertion or removal.
NOTE: The drive status indicator remains off until all hard
drives are initialized after the system is turned on. Drives are
not ready for insertion or removal during this time.
Blinks green, amber, and turns off Predicted drive failure
Blinks amber four times per second Drive failed
Blinks green slowly Drive rebuilding
Steady green Drive online
Blinks green three seconds, amber three seconds, and
turns off six seconds
Rebuild aborted
3
Hard drive indicator codes 11

Installing and removing system components
Safety instructions
NOTE: Whenever you need to lift the system, get others to assist you. To avoid injury, do not attempt to lift the system by
yourself.
WARNING: Opening or removing the system cover when the system is on may expose you to a risk of electric
shock.
CAUTION: Do not operate the system without the cover for a duration exceeding five minutes.
CAUTION: Many repairs may only be done by a certified service technician. You should only perform
troubleshooting and simple repairs as authorized in your product documentation, or as directed by the online or
telephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by
your warranty. Read and follow the safety instructions that came with the product.
NOTE: Dell recommends that you always use a static mat and static strap while working on components inside the system.
Before working inside your system
Steps
1. Turn off the system, including any attached peripherals.
2. Disconnect the system from the electrical outlet and disconnect the peripherals.
3. Remove the system cover.
After working inside your system
Steps
1. Install the system cover.
2. Reconnect the system to its electrical outlet.
3. Turn the system on, including any attached peripherals.
Recommended tools
You need the following tools to perform the removal and installation procedures:
●Key to the bezel lock. This is only required when you have a bezel.
●#2 Phillips screwdriver
4
12 Installing and removing system components

For how-to videos, documentation, and troubleshooting solutions, scan this QR code, or click here: http://www.Dell.com/QRL/
Workstation/R7910
System Overview
Figure 3. Front and Back View
Table 4. Features and indicators of Precision 7910.
Item Indicator, Button, or
Connector
Icon Description
1 Power-on indicator, power
button
The power-on indicator lights when the system power is on.
The power button controls the power supply output to the
system.
NOTE: On ACPI-compliant operating systems, turning off
the system using the power button causes the system to
perform a graceful shutdown before power to the system
is turned off.
Installing and removing system components 13

Table 4. Features and indicators of Precision 7910. (continued)
Item Indicator, Button, or
Connector
Icon Description
2 NMI button Used to troubleshoot software and device driver errors when
running certain operating systems. This button can be pressed
using the end of a paper clip.
Use this button only if directed to do so by qualified support
personnel or by the operating system documentation.
3 System identification button The identification buttons on the front and back panels can be
used to locate a particular system within a rack. When one of
these buttons is pressed, the LCD panel on the front and the
system status indicator on the back flashes until one of the
buttons is pressed again.
Press to toggle the system ID on and off.
If the system stops responding during POST, press and hold
the system ID button for more than five seconds to enter
BIOS progress mode.
To reset iDRAC (if not disabled in F2 iDRAC setup) press and
hold the button for more than 15 seconds.
4 Video connector Allows you to connect a VGA display to the system.
5 LCD menu buttons Allow you to navigate the control panel LCD menu.
6 Information tag A slide-out label panel which allows you to record system
information such as Service Tag, NIC, MAC address and so
on as per your need.
7 LCD panel Displays system ID, status information, and system error
messages. The LCD lights blue during normal system
operation. The LCD lights amber when the system needs
attention, and the LCD panel displays an error code followed
by descriptive text.
NOTE: If the system is connected to a power source and
an error is detected, the LCD lights amber regardless of
whether the system is turned on or off.
8 Hard drives Up to eight 2.5 inch drives.
9 vFlash media card slot Allows you to insert a vFlash media card.
10 USB connector Allows you to connect USB devices to the system. The ports
are USB 2.0-compliant.
11 USB management port/iDRAC
Direct
Enables you to connect USB devices to the system
or provides access to the iDRAC Direct features. For
more information, see the Integrated Dell Remote Access
Controller User’s Guide at Dell.com/idracmanuals. The USB
management port is USB 2.0-compliant.
12 Optical drive (optional) One optional SATA DVD-ROM drive or DVD+/-RW drive.
13 System identification button The identification buttons on the front and back panels can be
used to locate a particular system within a rack.
Precision Rack
7910
When one of these buttons is pressed,
the LCD panel on the front and the
system status indicator on the back
flashes until one of the buttons is
pressed again.
Press to toggle the system ID on and off.
14 Installing and removing system components

Table 4. Features and indicators of Precision 7910. (continued)
Item Indicator, Button, or
Connector
Icon Description
If the system stops responding during POST, press and hold
the system ID button for more than five seconds to enter
BIOS progress mode.
To reset iDRAC (if not disabled in F2 iDRAC setup) press and
hold the button for more than 15 seconds.
14 System identification
connector
Connects the optional system status indicator assembly
through the optional cable management arm.
15 iDRAC8 Enterprise port Dedicated management port.
16 Half-height PCIe expansion-
card slot (3)
Allows you to connect up to three half-height PCI Express
expansion cards.
17 Serial connector Allows you to connect a serial device to the system.
18 Video connector Allows you to connect a VGA display to the system.
19 USB connector (2) Allows you to connect USB devices to the system. The ports
are USB 3.0-compliant.
20 Full-height PCIe expansion
card slot (4)
Allows you to connect up to four single wall or two double
wide PCI Express expansion cards.
21 Ethernet connector (4) Four integrated 10/100/1000 Mbps NIC connectors
or
Four integrated connectors that include:
●Two 10/100/1000 Mbps NIC connectors
●Two 100 Mbps/1 Gbps/10 Gbps NIC connectors
22 Power supply unit AC 1100 W
Front bezel (optional)
Removing the front bezel
Steps
1. Unlock the bezel lock at the left end of the bezel.
2. Lift the release latch next to the bezel lock.
3. Pull the left end of the bezel, unhook the right end and remove the bezel.
Installing the front bezel
Steps
1. Hook the right end of the bezel onto the chassis.
2. Fit the free end of the bezel onto the system.
3. Secure the bezel with the keylock.
Installing and removing system components 15

Removing the system cover
Prerequisites
1. Ensure that you read the Safety instructions.
2. Turn off the system, including any attached peripherals.
3. Disconnect the system from the electrical outlet and peripherals.
4. Rotate the latch release lock counter clockwise to the unlocked position.
5. Lift the latch and rotate the latch toward the back of the system.
6. Hold the cover on both sides, and lift the cover away from the
system.
1. system cover
2. latch
3. latch release lock
To see a video on removing and installing System Cover, scan this QR code, or click here: http://www.Dell.com/QRL/
Workstation/R7910/Cover
Installing the system cover
Prerequisites
Ensure that you read the Safety Instructions.
16 Installing and removing system components

To see a video on removing and installing System Cover, scan this QR code, or click here: http://www.Dell.com/QRL/
Workstation/R7910/Cover
Steps
1. Align the slots of the system cover with the tabs on the chassis.
2. Press the cover release latch, and push the cover toward the front of the chassis until the latch locks into place.
3. Turn the latch release lock clockwise to the locked position.
4. Install the optional bezel.
5. Reconnect the system to its electrical outlet and turn the system on, including any attached peripherals.
Inside the system
CAUTION: Many repairs may only be done by a certified service technician. You should only perform
troubleshooting and simple repairs as authorized in your product documentation, or as directed by the online or
telephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by
your warranty. Read and follow the safety instructions that came with the product.
Installing and removing system components 17

Figure 4. Inside the system—Precision Rack
7910
1. cooling-fan (6)
2. processor (2)
3. DIMM (24)
4. PCIe card holder
5. internal USB port
6. power supply unit (2)
7. expansion-card riser (3)
8. network daughter card
9. expansion-card riser (2)
10. expansion-card riser (1)
11. hard-drive backplane
18 Installing and removing system components

Cooling shroud
Removing the cooling shroud
Prerequisites
CAUTION: Many repairs may only be done by a certified service technician. You should only perform
troubleshooting and simple repairs as authorized in your product documentation, or as directed by the online or
telephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by
your warranty. Read and follow the safety instructions that came with the product.
1. Ensure that you read the Safety instructions.
2. Follow the procedure listed in Before working inside your system.
3. If installed, remove the full-length PCIe cards.
CAUTION: Never operate your system with the cooling shroud removed. The system may get overheated quickly,
resulting in shutdown of the system and loss of data.
Steps
Hold the shroud and lift it away from the system.
Figure 5. Removing and installing the cooling shroud
a. cooling shroud
b. touch point (2)
Next steps
1. Replace the cooling shroud. See Installing the cooling shroud
2. Follow the procedure listed in After working inside your system.
Installing the cooling shroud
Prerequisites
CAUTION: Many repairs may only be done by a certified service technician. You should only perform
troubleshooting and simple repairs as authorized in your product documentation, or as directed by the online or
telephone service and support team. Damage due to servicing that is not authorized by Dell is not covered by
your warranty. Read and follow the safety instructions that came with the product.
1. Ensure that you read the Safety instructions.
Installing and removing system components 19

2. Align the tabs on the cooling shroud with the securing slots on the chassis.
3. Lower the cooling shroud into the chassis until it is firmly seated.
4. Follow the procedure listed in After working inside your system.
System memory
Your system supports DDR4 registered DIMMs (RDIMMs), and load reduced DIMMs (LRDIMMs).
NOTE: MT/s indicates DIMM speed in MegaTransfers per second.
Memory bus operating frequency can be 1866 MT/s, or 2133 MT/s depending on the following factors:
●DIMM type (RDIMM or LRDIMM)
●Number of DIMMs populated per channel
●System profile selected (for example, Performance Optimized, Custom, or Dense Configuration Optimized)
●Maximum supported DIMM frequency of the processors
The system contains 24 memory sockets split into two sets of 12 sockets, one set per processor. Each 12-socket set is
organized into four channels. In each channel, the release levers of the first socket are marked white, the second socket black,
and the third socket green.
NOTE: DIMMs in sockets A1 to A12 are assigned to processor 1 and DIMMs in sockets B1 to B12 are assigned to processor
2.
20 Installing and removing system components