ASROCK 2U4G Series User manual

2U4G Series
User Manual
Version 1.0
Published March 2019
Copyright©2019 All rights reserved.

Version 1.0
Published December 2020
Copyright©2020 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”

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.

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 9
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 17
3.3 Power Supply 20
3.4 System Fan 22
3.5Front GPU Card (on the riser-card assembly) 23
3.6 Rear GPU Card (on the riser-card assembly) 25
3.7 Installing a LAN Card (for 2U4G-C621WS only) 28
3.8 Installing a PCIE Card (for 2U4G-EPYC only) /
Retimer Card (PE-SSD-RT) (for 2U4G-C621WS only) 30
3.9LAN Mezzanine Card (for 2U4G-ROME/2T only) 32

Appendix A 35
Installing the CPU (Socket: LGA-3647) 35
Installing the CPU (Socket: LGA-4094) 38
Appendix B 42
Jumper Settings for the Riser Board 42
Appendix C 43
Block Diagram: EPYCD8 (for 2U4G-EPYC) 43
Block Diagram: EP2C621D12 WS (for 2U4G-C621WS) 44
Block Diagram: ROMED8QM-2T (2U4G-ROME/2T) 45

2U4G Series
PB 1
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Chapter 1 Introduction
ank you for purchasing 2U4G Series, a reliable system produced under our
consistently stringent quality control. It delivers excellent performance with robust
design conforming to our commitment to quality and endurance.
e illustrations shown in this manual are examples only, the actual system may dier
slightly .
Because the hardware specications might be updated, the content of this documentation
will be subject to change without notice.

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1.1 Shipping Box Contents
Item Quantity
GPU Power Cable (Red & Orange / L=800mm ; Blue & Green / L=500mm) 4
PMBus Cable (L=390mm) 1
Power ATX Cable (8PIN) (L=350mm) 2
Power ATX Cable (24 PINTO 24 PIN ) (L=150mm) 1
SWB Power Cable (SWB CABLE 2*6P(3.0)PWR; L=400mm) 3
HDD Power Cable (HDD PWR 2*4P TO 2*6P; L=800mm) 1
SLIMLINE Cables (L=800mm / 500mm) 6
Front Control Cable (2*10P(2.0)TO 2*10P+2*5P(2.54)) 1
MNG Cable(L=960mm) 1
MINISAS HD to OcuLink (S/T) Cable (L=710mm) (2U4G-C621WS only) 2
USB Cable (25P 2.54HSG TO 2.0HSG) (L=1.25M) (2U4G-C621WS only) 1
SATA 6G Cable (L=820mm) (2U4G-C621WS only) 4
SGPIO Cable (L=615mm) (2U4G-C621WS only) 1
MINISAS HD TO 4*SATA+SGPIO Cable (L=700mm) (2U4G-EPYC only) 1
USB Cable (USD 3.0(20P) TO 2*5P HEADER) (L=880mm) (2U4G-EPYC only) 1
OcuLink Cables (L=600mm) (2U4G-EPYC only) 2
Accessory Box 1
Slide Rail Kit 1
Support CD 1
User Manual 1
Quick Installation Guide 1
If any items are missing or appear damaged, contact your authorized dealer.

2U4G Series
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1.2 Specications
2U4G Series (2U4G-EPYC / 2U4G-C621WS / 2U4G-ROME/2T)
System Physical Status
Form Factor 2U Rackmount
Dimension
(D x W x H)
438x 795x 87.5 mm (without ear)
Support MB Size EATX 12" x 13" (EP2C621D12 WS) / ATX 12 " x 9.6" (EPYCD8)
/ ATX 12 " x 9.6" (ROMED8QM-2T)
Front Panel (per node)
Buttons • Power button
• UID button
LEDs • Power LED
• UID LED
• LAN activity LED
• System Event LED
I/O Port 2 x USB 2.0 ports
Drive Bay
External • 4 x 2.5" SATA 6GB/s HDDs (1x SATA3 HDD could support
NVME SSD or SATA3 6GB/s HDDs)
• 1 x NVME SSD
System Cooling
Fan 6 x 80*38 mm system fans
Power Supply
Capacity 2 (1+1), Redundant
Input 200~240V , 15A, 50/60Hz
Output Watts 2000W
Eciency Platinum
GPU Card (on the riser card assembly)
GPU Watts Max 300w /per card
Support GPU 4 x GPU cards
Please refer to the user manual of the motherboard you use for detailed information about
motherboard components and features.

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Chapter 2 Server System Overview
is chapter provides diagrams showing the location of important components of
the server system.
2.1 System Components
5 x 2.5” Hot-Swap HDD Trays
Sever Board
2 x Power Supply Units
6 x System Fans
Front Controls and Indicators
4 x Riser Card Assemblies (GPU Cards)
1 x Riser Card Assemby (LAN Card)
(2U4G-C621WS only)
1 x PCIE Card Slot
(2U4G-C621WS only:
Retimer Card PE-SSD-RT
for NVME SSD support)

2U4G Series
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2.2 Internal Features
5
1
2 3 4
6
7
8910
11 12
14 15 16
13
17
No. Item / per node
1
Server Board
(e serverboard varies depending on the
system SKU.)
2PCIE Card Slot (for Retimer Card
PE-SSD-RT) (2U4G-C621WS only)
3 Riser Card Slot4 (GPU Card)
4Riser Card Slot5 (LAN Card)
(2U4G-C621WS only)
5 Power Supply Units
6 Power Distribution Boards
7System Fan2
8System Fan1
9System Fan3
No. Item / per node
10 System Fan4
11 System Fan5
12 System Fan6
13 Switch Board (2U4G-C621WS / 2U4G-
EPYC only)
14 Riser Card Slot3 (GPU Card)
15 Riser Card Slot2 (GPU Card)
16 Riser Card Slot1 (GPU Card)
17 2.5" HDD Trays

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2.3 System Front Panel
1
3
2
4567
No. Description
1 Control Panel Buttons and LEDs
2Front Vent
3 2.5" HDD Tray (NVME0)
4 2.5" HDD Tray (NVME1 / HDD1)
5 2.5" HDD Tray (HDD2)
6 2.5" HDD Tray (HDD3)
7 2.5" HDD Tray (HDD4)
To enable NVME SSD for 2U4G-C621WS system, please install the Retimer Card (PE-
SSD-RT) on the rear I/O (refer to Chapter 3.8 Installing a PCIE Card) and connect the the
Retimer Card to the motherboard via the Retimer Card cables.

2U4G Series
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2.4 System Rear Panel
2U4G-EPYC
2
1345
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. You 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 I/O Shield (depends on the specication of the server board)
3Rear Vent
4 Add-on Card Slot (GPU Card)
5 Add-on Card Slot (PCIE Card)
2U4G-C621WS
3
1456
2
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. You 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.
2Rear Vent
3 I/O Shield (depends on the specication of the server board)
4 Add-on Card Slot (LAN Card)
5 Add-on Card Slot (GPU Card)
6 Add-on Card Slot (Retimer Card PE-SSD-RT )

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2U4G-ROME/2T
2
1345
Redundant PSU 1+1: Only one PSU is allowed to be removed while the server is running.
6
No. Description
1 2 x Power Supply Units (Redundant PSU 1+1)
*Server requires 1 working PSU, with 1 redundant PSU. You 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 I/O Shield (depends on the specication of the server board)
3Rear Vent
4 Mezzanine Card Slot (LAN Card)
5 Add-on Card Slot (GPU Card)
6 Add-on Card Slot
7 Add-on Card Slot (Retimer Card PE-SSD-RT )

2U4G Series
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2.5 Front Control Panel Buttons and LEDs
Front Control Panel
2
6
3
5
1
4
No. Description
1 LAN2 Activity LED
2 LAN1 Activity LED
3 System Event LED
4 2 x USB 2.0 Ports
5 Power Button and LED
6 UID 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.
UID Button
Press the UID button on the rear panel to toggle the front panel UID LED on and o. You
are able to locate the server you’re working on from behind a rack of servers.
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.

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LAN1, LAN2 LEDs
Status Description
Green Link between system and network or no access
Blinking Green Network access
System Event LED
Status Description
O Running or normal operation
Red At least one sensor has critical alert
2.6 PSU LED
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

2U4G Series
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2.7 Drive Tray LEDs
1
2
No. Description
1 HDD ACT LED
2 HDD STATUS LED
Status LED Denitions
HDD ACT LED
Status Description
Solid Green HDD active
Blinking Green HDD accessing or reading
O No HDD
HDD STATUS LED
Status Description
O Normal
Red HDD failed

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Chapter 3 Hardware Installation and
Maintenance
is chapter helps you assemble the chassis and install components.
Before You Begin
Before you work 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 you 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 you press 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 you use for instructions on how to install server
board components.

2U4G Series
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3.1 Server Top Cover
Removing the Server Top Cover
1. Remove the screws that secure the top rear 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 rear cover.
2
1
1
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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3. Release the thumbscrews that secure the top front cover to the chassis.
4. Push the top front cover toward the FRONT of the chassis to remove the cover from the
locked position. Li up and remove the top front cover.
4
3
3

2U4G Series
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Installing the Server Top Cover
1. Lower the top front cover on the chassis, making sure the side latches align with the
cutouts. Slide the top front cover toward the REAR of the chassis.
2. Hand tighten the thumbscrews on the front.
1
2
2