ASROCK 4U4G Series User manual

4U4G Series
User Manual
Version 1.0
Published March 2022
Copyright©2022 All rights reserved.

Version 1.0
Published May 2023
Copyright©2023 All rights reserved.
Copyright Notice:
No part of this documentation may be reproduced, transcribed, transmitted, or translated
in any language, in any form or by any means, except duplication of documentation by the
purchaser for backup purpose, without written consent of us.
Products and corporate names appearing in this documentation may or may not be
registered trademarks or copyrights of their respective companies, and are used only for
identication or explanation and to the owners’ benet, without intent to infringe.
Disclaimer:
Specifications and information contained in this documentation are furnished for
informational use only and subject to change without notice, and should not be
constructed as a commitment by us. We assumes no responsibility for any errors or
omissions that may appear in this documentation.
With respect to the contents of this documentation, we do not provide warranty of any
kind, either expressed or implied, including but not limited to the implied warranties or
conditions of merchantability or tness for a particular purpose.
In no event shall we, our directors, ocers, employees, or agents be liable for any indirect,
special, incidental, or consequential damages (including damages for loss of prots, loss of
business, loss of data, interruption of business and the like), even if we have been advised
of the possibility of such damages arising from any defect or error in the documentation or
product.
is device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that
may cause undesired operation.
CALIFORNIA, USA ONLY
e Lithium battery adopted on this motherboard contains Perchlorate, a toxic substance
controlled in Perchlorate Best Management Practices (BMP) regulations passed by the
California Legislature. When you discard the Lithium battery in California, USA, please
follow the related regulations in advance.
“Perchlorate Material-special handling may apply, see www.dtsc.ca.gov/hazardouswaste/
perchlorate”
ASRock Rack’s Website: www.ASRockRack.com

Setting up the Server in a Restricted Access Location
• Access can only be gained by service persons or by users who have been instructed
about the reasons for the restrictions applied to the location and about any precautions
that shall be taken.
• Access is through the use of a tool or lock and key, or other means of security, and is
controlled by the authority responsible for the location.
• Leave enough clearance (25 inches in the front and 30 inches in the back of the rack) to
allow the front door to be opened completely and to allow for sucient airow.
• is product is for installation merely in a Restricted Access Location.
• is product is not suitable for use with visual display work place devices according to §2
of the the German Ordinance for Work with Visual Display Units.
Replaceable Batteries
CAUTION
RISK OF EXPLOSION IF BATTERY IS REPLACED BY AN INCORRECT TYPE.
DISPOSE OF USED BATTERIES ACCORDING TO THE INSTRUCTIONS
Warning
When removal of the chassis lid required for servicing:
- Turn o power and unplug any power cords/cables, and
- Reinstall the chassis lid before restoring power.
Important Safety Instructions
Pay close attention to the following safety instructions before performing any of the
operation. Basic safety precautions should be followed to protect yourself from harm and
the product from damage:
• Operation of the product should be carried out by suitably trained, qualied, and
certied personnel only to avoid risk of injury from electrical shock or energy hazard.
• Disconnect the power cord from the wall outlet when installing or removing main
system components, such as the motherboard and power supply unit.
• Place the system on a stable and at surface.
• Use extreme caution when working with high-voltage components.
• When handling parts, use a grounded wrist strap designed to prevent static discharge.
• Keep the area around the system clean and clutter-free.
• Keep all components and printed circuit boards (PCBs) in their antistatic bags when
not in use.
• Handle a board by its edges only; do not touch its components, peripheral chips,
memory modules or contacts.
• e power cord must be connected to a socket or outlet with a ground connection.
Caution! Shock hazard!
Disconnect all power sources.

4 1
Contents
Chapter 1 Introduction 1
1.1 Shipping Box Contents 2
1.2 Specications 3
Chapter 2 Server System Overview 4
2.1 System Components 4
2.2 Internal Features 5
2.3 System Front Panel 6
2.4 System Rear Panel 7
2.5 Front Control Panel Buttons and LEDs 8
2.6 PSU LED 10
2.7 Drive Tray LEDs 11
Chapter 3 Hardware Installation and
Maintenance 12
3.1 Server Top Cover 13
3.2 Hard Drive 15
3.3 Power Supply 17
3.4 System Fan 19
3.5 GPU Card Fan 22
3.6 Hold-Down Bar (for GPU Card) 23
3.7 Add-on Card (PCIE/GPU Card) 25
3.8 Air Duct 27
Appendix A Installing the CPU 28
Appendix B Installing Memory Modules (DIMM) 40

4U4G Series
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Chapter 1 Introduction
Thank you for purchasing 4U4G Series, a reliable barebone system produced under our
consistently stringent quality control. It delivers excellent performance with robust design
conforming to our commitment to quality and endurance.
This guide provides the instructions of insertion and extraction of chassis components,
such as chassis covers, system fans, power supplies, hard disk drive trays, and other main
components this system supports. If the system is pre-installed a serverboard, please refer
to the user's manual of the serverboard for the information of the serverboard components,
specications and BIOS settings.
e illustrations shown in this manual are for reference purposes only and may not exactly
match the purchased model.
Because the hardware specications might be updated, the content of this documentation
will be subject to change without notice.
Please visit the website for specic technical information about the model.
http://www.asrockrack.com/support/
System ASRock Rack Server Board
4U4G-SPC621D8 SPC621D8
4U4G-WRX80/2T WRX80D8-2T

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1.1 Shipping Box Contents
Item Quantity
4U4G -SPC621D8 -WRX80/2T
4U4G Series Barebone 1 1
System Board (MB) 1 1
Power Supply Unit (PSU) 2 2
System Fan 4 4
Front Panel Board (FPB) 1 1
2.5" HDD Backplane 1 1
Accessory Box 1 1
Slide Rail Kit (28" Toolless) 1 1
User Manual 1 1
Quick Installation Guide 1 1
If any items are missing or appear damaged, contact the authorized dealer.

4U4G Series
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1.2 Specications
4U4G Series
System Physical Status
Form Factor 4U Rackmount
Dimension
(D x W x H)
596.0x 430.4x 174.8 mm
Support MB Size ATX 12" x 9.6" / CEB 12" x 10.5" / EEB 12" x 13"
Front Panel (per node)
Buttons • Power w/ LED button
• UID w/LED button
• NMI button
LEDs • LAN Activity LED
• HDD Activity LED
• System Event LED
I/O Port 2 Type-A (USB 3.2 Gen1)
System Cooling
System Fan 4 PWM xed 80x38 mm fans
GPU Card Fan 2 PWM xed 80x38 mm GPU fans (optional)
External Drive Bay / Storage
Rear Side 2 Hot-swap 2.5" SATA drive bays
Internal Side 2 M-key (PCIe4.0 x4), supports 22110/2280/2260/2242/2230
form factor [FCH]
Power Supply
Type 1+1 CRPS
Output Watts 1008W @ 100-127V input / 1600W @ 200-240V input
Eciency 80-PLUS Platinum
AC Input Low-line: 100-127V, 47-63Hz ; High-line: 200-240V, 47-63Hz
GPU Card
GPU Watts Max 300w /per card
Support GPU 4 x GPU cards
Please refer to the user manual of the motherboard for detailed information about mother-
board components and features.

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Chapter 2 Server System Overview
This chapter provides diagrams showing the location of important components of the
server system.
2.1 System Components
Server Board
2 x Power Supply Units
Front Controls and Indicators
4 x GPU Card Slots
2 x 2.5” Hard Disk Drives Trays
4 x System Fans
2 x GPU Fans (Optional)

4U4G Series
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2.2 Internal Features
6
1
2
4
5
8
7
9
10 10
3
No. Item
1Server Board
(e serverboard varies depending on the system SKU.)
2 2 x GPU Fans (optional)
3 8 x Full-Height PCIe Slots (or 4 x Double-Slot GPU Cards)
4 2 x Power Supply Units
5 2 x 2.5" Hot Swap HDD Trays
6 Hold-Down Bar (for GPU Card)
7 4 x 80*38mm System Fans
8Fan-Retention Bracket
9 Front Control Panel / Board (FPB)
10 Chassis Handle

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2.3 System Front Panel
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21
No. Description
1Chassis Handles
2Front Vent
3 Control Panel Buttons and LED Indicators
2 x USB 3.2 Gen1 Ports
4 Blanking Plate (for a VGA port, depending on the system sku)

4U4G Series
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2.4 System Rear Panel
5
1234
Redundant PSU 1+1: Only one PSU is allowed to be removed while the server is running.
No. Description
1 2 x Power Supply Units (Redundant PSU 1+1)
*Server requires 1 working PSU, with 1 redundant PSU. It must have at least one active supply,
installed, functioning and connected to AC. Only one of the PSUs is allowed to be removed while
the server is running.
2 2 x 2.5" HDD Trays
3Rear Vent
4 I/O Shield (depending on the specication of the server board)
5 8 x Full-Height PCIe Slots (or 4 x Double-Slot GPU Cards)

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2.5 Front Control Panel Buttons and LEDs
Front Control Panel
NMI RST L1 L2 SYS
ID
12
8
7
6
34
L3 L4
5
No. Description
1 ID Button and LED
2 Power Button and LED
3 NMI (Nonmaskable Interrupt) Button
4 System Reset Button
5 2 x USB 3.2 Gen1 Ports
6 LAN1, LAN2, LAN3, LAN4 Activity LED
7 HDD Activity LED
8 System Event LED
Power Button
Press the power switch button to toggle the system power on and o modes.
To remove all power from the system completely, disconnect the power cord from the
server.
ID Button
Press the ID button on the rear panel to toggle the front panel ID LED on and o. is can
locate the server that is working on from behind a rack of servers.
NMI (Nonmaskable Interrupt) Button
Press the NMI button with a paper clip or pin to generate a nonmaskable interrupt and to
put the server in a halt state for examination.
System Reset Button
When the system is completely unresponsive, press the system reset button to reboot the
server without shutting it o and initialize the system.

4U4G Series
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Status LED Denitions
Power LED
Status Description
Green Power on
O Power o
ID LED
Status Description
Blue System identication is active.
O System identication is disabled.
LAN1, LAN2, LAN3, LAN4 LEDs
Status Description
Green Link between system and network or no access
Blinking Green Network access
HDD Activity LED
Status Description
Blinking Green HDD access
O HDD idle
System Event LED
Status Description
O Running or normal operation
Red At least one sensor has critical alert

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2.6 PSU LED
PSU LED
PSU Status LED
Status Description
Green Normal work; output ON and OK
Amber Module fault/protection in operating mode
(failure, OCP, OVP, Fan Fail, OTP, UVP)
AC cord unplugged
Amber blinking at 0.5Hz Warning (high temp, high power, high current, slow fan)
Green blinking at 0.5Hz AC Present Only 12VSB on (PS o) or PS in Smart
Redundant state

4U4G Series
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2.7 Drive Tray LEDs
1
2
No. Description
1 HDD Power LED
2 HDD Activity LED
Status LED Denitions
HDD Power LED
Status Description
Blue HDD powered-on
O No power to HDD
HDD Activity LED
Status Description
Solid Green HDD active
Blinking Green HDD accessing or reading
Red HDD failed
O HDD powered-o

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Chapter 3 Hardware Installation and
Maintenance
is chapter helps user to assemble the chassis and install components.
Before You Begin
Before working with the server, pay close attention to the “Important Safety Instructions”
at the beginning of this manual.
1. Make sure the server is powered o.
Power down the server if it is still running.
(1) Press the Power button to power o the server from full-power mode to o mode.
e Power LED at the front turns from solid green to blinking green.
(2) Disconnect the power cord rst from the AC outlet and then from the server.
e power LED turns o.
2. Ensure to have a clean and stable working environment. Avoid dust and dirt because
contaminants may cause malfunctions.
3. Ground yourself properly before touching any system component. A discharge of static
electricity may damage components. Wear a grounded wrist strap if available.
e server is not completely powered down when pressing the Power button on the front
panel. To remove all power from the system completely, be sure to disconnect the power
cord from the server.
1. Some components are already pre-installed. Simply properly connect the relavant cables before
or aer installation. See the Quick Installation Guide for more details.
2. Refer to the user manual of the server board for instructions on how to install server board
components.

4U4G Series
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3.1 Server Top Cover
Removing the Server Top Cover
1. Remove the screws that secure the top cover to the chassis.
2. Push the top cover toward the REAR of the chassis to remove the cover from the locked
position. Li up and remove the top cover.
2
1
1
2
1. Before removing the top covers, power o the server and unplug the power cord.
2. e system must be operated with all the chassis top covers installed to ensure proper cooling.

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Installing the Server Top Cover
1. Lower the top cover on the chassis, making sure the side latches align with the cutouts.
Slide the top cover toward the FRONT of the chassis.
2. Secure the top cover in place with screws.
1
2
2
1

4U4G Series
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3.2 Hard Drive
3.2.1 Installing a 2.5" Hard Disk Drive into a Hard Drive Tray
e system supports hot-swappable 2.5" hard drives. e hard drive trays are located on
the rear of the chassis.
Removing Hard Drive Trays from the Chassis
1. Press the locking lever latch on the drive tray to unlock the retention lever.
2. Rotate the lever out and away from the module bay and pull the hard drive out of the
HDD tray.
2
1

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Installing a 2.5” Hard Drive to the Hard Drive Tray
1. Place a 2.5" HDD into the tray with the printed circuit board side facing down.
Carefully align the mounting holes in the hard drive and the tray.
2. Secure the hard drive using the screws.
3. Slide the drive tray into the HDD bay until the drive is fully seated.
4. Push in the locking lever to lock the HDD tray into place.
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