Dell Precision 7865 Tower Operation and maintenance manual

Precision 7865 Tower
Setup and Specifications
Regulatory Model: D03T
Regulatory Type: D03T002
July 2022
Rev. A00

Notes, cautions, and warnings
NOTE: A NOTE indicates important information that helps you make better use of your product.
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.
© 2022 Dell Inc. or its subsidiaries. All rights reserved. Dell Technologies, Dell, and other trademarks are trademarks of Dell Inc. or its
subsidiaries. Other trademarks may be trademarks of their respective owners.

Chapter 1: Set up your computer................................................................................................... 4
Chapter 2: Views of Precision 7865 Tower.................................................................................... 9
Front....................................................................................................................................................................................... 9
Back.......................................................................................................................................................................................10
Chapter 3: Specifications of Precision 7865 Tower.......................................................................11
Dimensions and weight......................................................................................................................................................11
Processor.............................................................................................................................................................................. 11
Chipset..................................................................................................................................................................................12
Operating system............................................................................................................................................................... 12
Memory.................................................................................................................................................................................12
Memory matrix....................................................................................................................................................................13
External ports......................................................................................................................................................................14
Internal slots........................................................................................................................................................................15
Ethernet............................................................................................................................................................................... 15
Wireless module..................................................................................................................................................................15
Audio..................................................................................................................................................................................... 16
Storage................................................................................................................................................................................. 16
RAID.......................................................................................................................................................................................17
Media-card reader..............................................................................................................................................................17
Power ratings......................................................................................................................................................................18
Power supply connector...................................................................................................................................................18
GPU—Discrete...................................................................................................................................................................19
Video port resolution.........................................................................................................................................................19
Hardware security.............................................................................................................................................................20
Environmental..................................................................................................................................................................... 21
Regulatory compliance......................................................................................................................................................21
Operating and storage environment..............................................................................................................................21
Chapter 4: Getting help and contacting Dell................................................................................ 23
Contents
Contents 3

Set up your computer
1. Connect the keyboard and mouse.
Connect the keyboard and mouse
2. Connect to your network using a cable, or connect to a wireless network.
1
4 Set up your computer

connect to a network
3. Connect the display.
Connect the
display
4. Connect the power cable.
Set up your computer 5

5. Press the power button.
6Set up your computer

6. Finish operating system setup.
For Ubuntu:
Follow the on-screen instructions to complete the setup. For more information about installing and configuring Ubuntu,
search in the Knowledge Base Resource at www.dell.com/support.
For Windows:
Follow the on-screen instructions to complete the setup. When setting up, Dell recommends that you:
●Connect to a network for Windows updates.
NOTE: If connecting to a secured wireless network, enter the password for the wireless network access when
prompted.
●If connected to the internet, sign-in with or create a Microsoft account. If not connected to the internet, create an
offline account.
●On the Support and Protection screen, enter your contact details.
7. Locate and use Dell apps from the Windows Start menu—Recommended
Table 1. Locate Dell apps
Resources Description
My Dell
Centralized location for key Dell applications, help articles, and other important information about
your computer. It also notifies you about the warranty status, recommended accessories, and
software updates if available.
Set up your computer 7

Table 1. Locate Dell apps (continued)
Resources Description
SupportAssist
SupportAssist proactively and predictively identifies hardware and software issues on your
computer and automates the engagement process with Dell Technical support. It addresses
performance and stabilization issues, prevents security threats, monitors, and detects hardware
failures. For more information, see SupportAssist for Home PCs User's Guide at www.dell.com/
serviceabilitytools. Click SupportAssist and then, click SupportAssist for Home PCs.
NOTE: In SupportAssist, click the warranty expiry date to renew or upgrade your warranty.
Dell Update
Updates your computer with critical fixes and latest device drivers as they become available. For
more information on using Dell Update, search in the Knowledge Base Resource at www.dell.com/
support.
Dell Digital Delivery
Download software applications, which are purchased but not preinstalled on your computer.
For more information on using Dell Digital Delivery, search in the Knowledge Base Resource at
www.dell.com/support.
8 Set up your computer

Views of Precision 7865 Tower
Front
1. Externally facing M.2 flexbay (optional)
2. Externally facing SATA flexbay (optional)
3. Slim optical-drive (optional)
4. Power button
5. Hard-drive activity light
6. Universal audio port
7. USB 3.2 Gen 1 port
8. USB 3.2 Gen 1 port
9. USB 3.2 Gen 2 Type-C port with PowerShare
10. USB 3.2 Gen 2 Type-C port
11. SD-card reader
2
Views of Precision 7865 Tower 9

Back
1. Power port
NOTE: This is a C20 inlet port.
2. Power-supply diagnostics light
3. PS2 port (optional)
4. Serial port (optional)
5. Line-out audio port
6. RJ45 Ethernet port (1 Gbps)
7. RJ45 Ethernet port (10 Gbps)
8. Three USB 3.2 Gen 2 Type-C ports
9. Five PCIe Gen4 expansion slots
10. USB 3.2 Gen 1 port with Smart Power On
11. Two USB 3.2 Gen 1 ports
10 Views of Precision 7865 Tower

Specifications of Precision 7865 Tower
Dimensions and weight
The following table lists the height, width, depth, and weight of your Precision 7865 Tower.
Table 2. Dimensions and weight
Description Values
Height ●414.00 mm (16.29 in.)
●417.90 mm (16.45 in.) with rubber foot protruding
Width ●172.60 mm (6.79 in.)
●176.50 mm (6.94 in.) with rubber foot protruding
Depth ●429.60 mm (16.90 in.)
●452.10 mm (17.79) with lock structure protruding
Weight
NOTE: The weight of your computer depends on the
configuration ordered and manufacturing variability.
●Minimum: 16.10 kg (35.5 lbs.)
●Maximum: 21.90 kg (48.28 lbs.)
Processor
The following table lists the details of the processors supported by your Precision 7865 Tower.
Table 3. Processor
Description Option one Option two Option three Option four Option five
Processor type AMD Ryzen
Threadripper PRO
5945WX
AMD Ryzen
Threadripper PRO
5955WX
AMD Ryzen
Threadripper PRO
5965WX
AMD Ryzen
Threadripper PRO
5975WX
AMD Ryzen
Threadripper PRO
5995WX
Processor
wattage
280 W 280 W 280 W 280 W 280 W
Processor core
count
12 16 24 32 64
Processor thread
count
24 32 48 64 128
Processor speed 4.10 GHz to 4.55
GHz
4.00 GHz to 4.55
GHz
3.80 GHz to 4.55
GHz
3.60 GHz to 4.55
GHz
2.70 GHz to 4.55 GHz
Processor cache 64 MB 64 MB 128 MB 128 MB 256 MB
Integrated
graphics
Not supported Not supported Not supported Not supported Not supported
3
Specifications of Precision 7865 Tower 11

Chipset
The following table lists the details of the chipset supported by your Precision 7865 Tower.
Table 4. Chipset
Description Values
Chipset AMD WRX80 Premium
Processor AMD Ryzen Threadripper PRO 5000
DRAM bus width 64-bit
Flash EPROM 32 MB + 16 MB
PCIe bus Up to Gen 4.0
Non-volatile memory Yes
BIOS configuration Serial Peripheral Interface (SPI) 256 Mbit (32 MB) located at SPI_FLASH
Trusted Platform Module (TPM) 2.0 (Discrete TPM
Enabled)
24 KB located at TPM 2.0 on chipset
Firmware-TPM (Discrete TPM disabled) By default the Platform Trust Technology feature is visible to the
operating system.
NIC EEPROM LOM configuration contained within SPI flash ROM instead of LOM
e-fuse
Operating system
Your Precision 7865 Tower supports the following operating systems:
●Windows 11 Pro, 64-bit
●Windows 11 Pro Downgrade (Windows 10 Pro Image-factory installed)
●Windows 11 CMIT Government Edition, 64-bit (China only)
●Red Hat Enterprise Linux 8.6
●Ubuntu Linux 20.04 LTS, 64-bit
Memory
The following table lists the memory specifications of your Precision 7865 Tower.
Table 5. Memory specifications
Description Values
Memory slots Eight DIMM slots
Memory type DDR4
Memory speed 3200 MHz
Maximum memory configuration 1024 GB
Minimum memory configuration 8 GB
12 Specifications of Precision 7865 Tower

Table 5. Memory specifications (continued)
Description Values
Memory size per slot 8 GB, 16 GB, 32 GB, 64 GB, 128 GB
Memory configurations supported ●8 GB, 1 x 8 GB, DDR4, 3200 MHz, ECC
●16 GB, 1 x 16 GB, DDR4, 3200 MHz, ECC
●16 GB, 2 x 8 GB, DDR4, 3200 MHz, ECC
●32 GB, 1 x 32 GB, DDR4, 3200 MHz, ECC
●32 GB, 2 x 16 GB, DDR4, 3200 MHz, ECC
●32 GB, 4 x 8 GB, DDR4, 3200 MHz, ECC
●64 GB, 1 x 64 GB, DDR4, 3200 MHz, ECC
●64 GB, 2 x 32 GB, DDR4, 3200 MHz, ECC
●64 GB, 4 x 16 GB, DDR4, 3200 MHz, ECC
●64 GB, 8 x 8 GB, DDR4, 3200 MHz, ECC
●128 GB, 1 x 128 GB, DDR4, 3200 MHz, ECC
●128 GB, 2 x 64 GB, DDR4, 3200 MHz, ECC
●128 GB, 4 x 32 GB, DDR4, 3200 MHz, ECC
●128 GB, 8 x 16 GB, DDR4, 3200 MHz, ECC
●256 GB, 2 x 128 GB, DDR4, 3200 MHz, ECC
●256 GB, 4 x 64 GB, DDR4, 3200 MHz, ECC
●256 GB, 8 x 32 GB, DDR4, 3200 MHz, ECC
●512 GB, 4 x 128 GB, DDR4, 3200 MHz, ECC
●512 GB, 8 x 64 GB, DDR4, 3200 MHz, ECC
●1024 GB, 8 x 128 GB, DDR4, 3200 MHz, ECC
Memory matrix
The following table lists the memory configurations supported on your Precision 7865 Tower.
Table 6. Memory matrix
Config
uration
Slot
DIMM1 DIMM2 DIMM3 DIMM4 DIMM5 DIMM6 DIMM7 DIMM8
8 GB
DDR4
8 GB
16 GB
DDR4
16 GB
16 GB
DDR4
8 GB 8 GB
32 GB
DDR4
32 GB
32 GB
DDR4
8 GB 8 GB 8 GB 8 GB
32 GB
DDR4
16 GB 16 GB
64 GB
DDR4
64 GB
Specifications of Precision 7865 Tower 13

Table 6. Memory matrix (continued)
64 GB
DDR4
32 GB 32 GB
64 GB
DDR4
16 GB 16 GB 16 GB 16 GB
64 GB
DDR4
8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB 8 GB
128 GB
DDR4
128 GB
128 GB
DDR4
64 GB 64 GB
128 GB
DDR4
32 GB 32 GB 32 GB 32 GB
128 GB
DDR4
16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB 16 GB
256 GB
DDR4
128 GB 128 GB
256 GB
DDR4
64 GB 64 GB 64 GB 64 GB
256 GB
DDR4
32 GB 32 GB 32 GB 32 GB 32 GB 32 GB 32 GB 32 GB
512 GB
DDR4
128 GB 128 GB 128 GB 128 GB
512 GB
DDR4
64 GB 64 GB 64 GB 64 GB 64 GB 64 GB 64 GB 64 GB
1024
GB
DDR4
128 GB 128 GB 128 GB 128 GB 128 GB 128 GB 128 GB 128 GB
External ports
The following table lists the external ports of your Precision 7865 Tower.
Table 7. External ports
Description Values
Network port ●One RJ45 Ethernet port, 1 GbE (rear)
●One RJ45 Ethernet port, 10 GbE (rear)
USB ports ●Two USB 3.2 Gen 1 ports (front)
●One USB 3.2 Gen 2 Type-C port with PowerShare (front)
●One USB 3.2 Gen 2 Type-C port (front)
●Three USB 3.2 Gen 2 Type-C ports (rear)
●Two USB 3.2 Gen 1 ports (rear)
●One USB 3.2 Gen 1 port with Smart Power On (rear)
Audio port ●One Universal audio port (front)
●One line-out audio port (rear)
Video port via Discrete GPU
Media-card reader One SD-card 6.0 slot (front)
14 Specifications of Precision 7865 Tower

Table 7. External ports (continued)
Description Values
Power-adapter port Not supported
Security-cable slot ●One Kensington security-cable slot
●One Padlock ring
Internal slots
The following table lists the internal slots of your Precision 7865 Tower.
Table 8. Internal slots
Description Values
SATA ●Two SATA 3.0 slots for 3.5-inch/2.5-inch hard drive and
slim optical drive
●Two SATA 3.0 slots for externally facing storage flexbay
PCIe Expansion ●Two full-height Gen4 PCIe x16 slot
●Three full-height Gen4 PCIe x8 slot
M.2 ●Two M.2 2230/2280 slot for PCIe NVMe Gen4 solid-state
drive
●Two M.2 2230/2280 slot for externally facing PCIe NVMe
Gen4 storage flexbays
NOTE: To learn more about the features of different
types of M.2 cards, see the knowledge base article
000144170 at www.dell.com/support.
Ethernet
The following table lists the wired Ethernet Local Area Network (LAN) specifications of your Precision 7865 Tower.
Table 9. Ethernet specifications
Description Values
Model number ●Realtek RTL8111-EPP USB 2.0 for DASH Manageability
●Marvel AQC113CS
Transfer rate ●1 Gbps
●10 Gbps
Wireless module
The following table lists the Wireless Local Area Network (WLAN) module supported on your Precision 7865 Tower.
Table 10. Wireless module specifications
Description Values
Model number Qualcomm WCN6856-DBS
Transfer rate Up to 3571 Mbps
Specifications of Precision 7865 Tower 15

Table 10. Wireless module specifications (continued)
Description Values
Frequency bands supported 2.4 GHz/5 GHz /6 GHz
NOTE: The 6 GHz frequency is supported on computers
installed with Windows 11 operating system only.
Wireless standards ●WiFi 802.11a/b/g
●Wi-Fi 4 (WiFi 802.11n)
●Wi-Fi 5 (WiFi 802.11ac)
●Wi-Fi 6E (WiFi 802.11ax)
Encryption ●64-bit and 128-bit WEP
●AES-CCMP
●TKIP
Bluetooth 5.3
Audio
The following table lists the audio specifications of your Precision 7865 Tower.
Table 11. Audio specifications
Description Values
Audio controller Realtek Audio Controller ALC4050-CG
Stereo conversion 24-bit DAC (Digital-to-Analog) and ADC (Analog-to-Digital)
Internal audio interface USB
External audio interface ●One Universal audio port (front)
●One line-out audio port (rear)
Number of speakers One (internal)
Internal-speaker amplifier Not supported
External volume controls Not supported
Speaker output:
Average speaker output 2 W
Peak speaker output 2.5 W
Subwoofer output Not supported
Microphone Via Universal audio port
Storage
This section lists the storage options on your Precision 7865 Tower.
Your system supports one or more of the following storage drives:
●Two 2.5-inch hard drives (internal)
●Two 2.5-inch hard drive (via externally facing storage flexbays)
16 Specifications of Precision 7865 Tower

●Two 3.5-inch hard drives, internal
●Two 3.5-inch hard drive (via externally facing storage flexbays)
●Two M.2 solid-state drives, internal
●Two M.2 solid-state drive (via externally facing storage flexbays)
NOTE: The system supports a maximum of two externally facing storage flexbay slots.
Table 12. Storage specifications
Storage type Interface type Capacity
2.5-inch, 7200 RPM, hard-disk drive SATA 3.0 500 GB
3.5-inch, 7200 RPM, hard-disk drive SATA 3.0 1 TB
3.5-inch, 7200 RPM, Enterprise hard-
disk drive
SATA 3.0 Up to 8 TB
M.2 2230, SSD, Class 35 PCIe NVMe Gen4 x4 256 GB
M.2 2280, SSD, Class 40 PCIe NVMe Gen4 x4 Up to 4 TB
M.2 2280, SSD, Class 40, Opal Self-
Encrypting Opal 2.0, FIPS
PCIe NVMe Gen4 x4 Up to 1 TB
RAID
For optimal performance when configuring drives as a RAID volume, Dell recommends drive models that are identical.
Table 13. RAID (Redundant Array of Independent Disks)
Type Supported
RAID 0 Yes
RAID 1 Yes
RAID 5 Yes
RAID 10 Yes
Precision 7865 Tower supports RAID with more than one hard drive
configuration.
Care must be taken to match not only the drive vendor, capacity, and class, but also the specific model. Drives from the same
vendor, with the same capacity, and even within the same class, can have very different performance characteristics for certain
types of IO operations. Thus, matching by model ensures that the RAID volumes are comprised of an homogeneous array of
drives that will deliver all the benefits of a RAID volume without incurring the additional penalties when one or more drives in the
volume are lower performing.
Media-card reader
The following table lists the media cards supported by your Precision 7865 Tower.
Table 14. Media-card reader specifications
Description Values
Media-card type One SD-card 6.0 slot
Specifications of Precision 7865 Tower 17

Table 14. Media-card reader specifications (continued)
Description Values
Media-cards supported ●Secure Digital (mSD)
●Secure Digital High Capacity (mSDHC)
●Secure Digital Extended Capacity (mSDXC)
NOTE: The maximum capacity supported by the media-card reader varies depending on the standard of the media card
installed in your computer.
Power ratings
The following table lists the power rating specifications of Precision 7865 Tower.
Table 15. Power ratings
Description Values
Type 1350 W Platinum internal power supply
Input voltage 90 VAC-264 VAC
Input frequency 47 Hz-63 Hz
Input current (maximum) 16 A
Output current (continuous) Operating:
●12 VA / 42 A
●12 VB / 36 A
●12 VC / 72 A
Standby mode:
●12 VA / 1.5 A
●12 VB / 5 A
Rated output voltage ●+12 VA
●+12 VB
●+12 VC
Temperature range
Operating 5°C to 45°C (41°F to 113°F)
Storage -40°C to 70°C (-40°F to 158°F)
Power supply connector
The following table lists the Power supply connector specifications of your Precision 7865 Tower.
Table 16. Power supply connector
1350 W (Platinum) ●Three 4-pin connectors for processor
●One 12-pin connector for system board
●Four 8-pin (6 + 2) auxiliary connectors for expansion cards
NOTE: This workstation uses high wattage power supply unit and has to be connected to a PDU (Power Distribution Unit)
at all times for protection of equipment.
18 Specifications of Precision 7865 Tower

GPU—Discrete
The following table lists the specifications of the discrete Graphics Processing Unit (GPU) supported by your Precision 7865
Tower.
Table 17. GPU—Discrete
Controller Memory size Memory type
NVIDIA GeForce RTX 3090 24 GB GDDR6
NVIDIA GeForce RTX 3080 10 GB GDDR6
NVIDIA RTX A6000 48 GB GDDR6
NVIDIA RTX A5500 24 GB GDDR6
NVIDIA RTX A4500 20 GB GDDR6
NVIDIA RTX A4000 16 GB GDDR6
NVIDIA RTX A2000 12 GB GDDR6
NVIDIA T1000 8 GB GDDR6
NVIDIA T400 4 GB GDDR6
NVIDIA Quadro GV100 32 GB HBM2
AMD Radeon RX 6900 XT 16 GB GDDR6
AMD Radeon Pro W6800 32 GB GDDR6
AMD Radeon Pro W6600 8 GB GDDR6
AMD Radeon Pro W6400 4 GB GDDR6
Video port resolution
The following table lists the video port resolution for your Precision 7865 Tower.
Table 18. Video port resolution
Graphics card Video ports Maximum supported resolution
NVIDIA GeForce RTX 3090 ●Three DP 1.4 ports
●One HDMI 2.1 port
7680 x 4320 @60 Hz
NOTE: Requires DSC
NVIDIA GeForce RTX 3080 ●Three DP 1.4 ports
●One HDMI 2.1 port
7680 x 4320 @60 Hz
NOTE: Requires DSC
NVIDIA RTX A6000 Four DP 1.2 ports 7680 x 4320 @ 24 bpp at 120Hz
NOTE: Requires two DPs 1.4a and
DSC
NVIDIA RTX A5500 Four DP 1.2 ports 7680 x 4320 @ 24 bpp at 120Hz
NOTE: Requires two DPs 1.4a and
DSC
Specifications of Precision 7865 Tower 19

Table 18. Video port resolution (continued)
Graphics card Video ports Maximum supported resolution
NVIDIA RTX A4500 Four DP 1.2 ports 7680 x 4320 @ 24 bpp at 120Hz
NOTE: Requires two DPs 1.4a and
DSC
NVIDIA RTX A4000 Four DP 1.2 ports 7680 x 4320 @ 24 bpp at 120Hz
NOTE: Requires two DPs 1.4a and
DSC
NVIDIA RTX A2000 Four mini-DP 1.2 ports 7680 x 4320 @ 24 bpp at 120Hz
NOTE: Requires two DPs 1.4a and
DSC
NVIDIA T1000 Four mini-DP 1.2 ports 7680 x 4320 @ 24 bpp at 120Hz
NOTE: Requires two DPs 1.4a and
DSC
NVIDIA T400 Three mini-DP 1.2 ports 7680 x 4320 @ 24 bpp at 120Hz
NOTE: Requires two DPs 1.4a and
DSC
NVIDIA Quadro GV100 Four mini-DP 1.2 ports 7680 x 4320 @ 24 bpp at 120Hz
NOTE: Requires four DP 1.3 links
AMD Radeon RX 6900 XT Three DP 1.4 ports 7680 x 4320 @60 Hz
NOTE: Requires DSC
AMD Radeon Pro W6800 Six mini-DP 1.4 ports 7680 x 4320 @60 Hz
AMD Radeon Pro W6600 Four DP 1.4 ports 7680 x 4320 @60 Hz
AMD Radeon Pro W6400 Two DP 1.4 ports 7680 x 4320 @60 Hz
Hardware security
The following table lists the hardware security of your Precision 7865 Tower.
Table 19. Hardware security
Hardware security
Kensington security-cable slot
Padlock loop
Chassis lock support - Coin locker
Chassis intrusion switch
Lockable bezel for externally-facing storage flexbay (included with M.2 NVMe drives, optional with SATA drives)
TPM 2.0 Discrete Hardware
20 Specifications of Precision 7865 Tower