ASRock Industrial 4X4-7840U-1U User manual

4X4-7840U-1U
4X4-7640U-1U
User Manual
Version 1.0
Published November 1, 2023
Copyright©2023 ASRockInd INC. All rights reserved.

Version 1.0
Published November, 2023
Copyright©2023 ASRockInd INC. 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
ASRockInd Inc.
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:
Specications 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 ASRockInd. ASRockInd assumes no
responsibility for any errors or omissions that may appear in this documentation.
With respect to the contents of this documentation, ASRockInd does 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 ASRockInd, its 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 ASRockInd has 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.
e terms HDMI®and HDMI High-Denition Multimedia Interface, and the HDMI
logo are trademarks or registered trademarks of HDMI Licensing LLC in the United
States and other countries.

WARNING
THIS PRODUCT CONTAINS A BUTTOON BATTERY
If swallowed, a button battery can cause serious injury or death.
Please keep batteries out of sight or reach of children.
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”
AUSTRALIA ONLY
Our goods come with guarantees that cannot be excluded under the Australian Consumer
Law. You are entitled to a replacement or refund for a major failure and compensation for
any other reasonably foreseeable loss or damage caused by our goods. You are also entitled
to have the goods repaired or replaced if the goods fail to be of acceptable quality and the
failure does not amount to a major failure. If you require assistance please call ASRockInd
Tel : [phone] ext.123 (Standard International call charges apply)
ASRockInd follows the green design concept to design and manufacture our products,
and makes sure that each stage of the product life cycle of ASRockInd product is in line
with global environmental regulations. In addition, ASRockInd disclose the relevant in-
formation based on regulation requirements.
DO NOT throw the motherboard in municipal waste. is product has been
designed to enable proper reuse of parts and recycling. This symbol of the
crossed out wheeled bin indicates that the product (electrical and electronic
equipment) should not be placed in municipal waste. Check local regulations
for disposal of electronic products.

Contents
Chapter 1 Introduction 1
1.1 Package Contents 1
1.2 Specications 2
1.3 Motherboard Layout 4
1.4 I/O Panel 6
1.5 Block Diagram 7
Chapter 2 Installation 8
2.1 Screw Holes 8
2.2 Pre-installation Precautions 8
2.3 Installation of Memory Modules 9
2.4 Expansion Slots 10
2.5 Onboard Headers and Connectors 11
Chapter 3 UEFI SETUP UTILITY 14
3.1 Introduction 14
3.1.1 Entering BIOS Setup 14
3.1.2 UEFI Menu Bar 15
3.1.3 Navigation Keys 16
3.2 Main Screen (Advanced Mode) 17
3.3 Advanced Screen 18
3.3.1 CPU Conguration 19
3.3.2 Chipset Conguration 20
3.3.3 Storage Conguration 22
3.3.4 Super IO Conguration 23

3.3.5 ACPI Conguration 24
3.3.6 USB Conguration 25
3.3.7 Trusted Computing 26
3.4 Hardware Health Event Monitoring Screen 28
3.5 Security Screen 29
3.6 Boot Screen 30
3.7 Exit Screen 31

1
4X4-7840U-1U_4X4-7640U-1U
Chapter 1 Introduction
Thank you for purchasing ASRockInd 4X4-7840U-1U / 4X4-7640U-1U motherboard, a
reliable motherboard produced under ASRockInd’s consistently stringent quality control. It
delivers excellent performance with robust design conforming to ASRockInd’s commitment
to quality and endurance.
In this manual, chapter 1 and 2 contain introduction of the motherboard and step-by-step
guide to the hardware installation. Chapter 3 contains the conguration guide to BIOS setup.
Because the motherboard specications and the BIOS soware might be updated, the
content of this manual will be subject to change without notice. In case any modica-
tions of this manual occur, the updated version will be available on ASRockInd website
without further notice.
ASRockInd website https://www.asrockind.com/en-gb/4X4-7840U-1U
https://www.asrockind.com/en-gb/4X4-7640U-1U
If you require technical support related to this motherboard, please visit our website for
specic information about the model you are using.
https://www.asrockind.com/en-gb/technical-support
1.1 Package Contents
ASRockInd 4X4-7840U-1U / 4X4-7640U-1U Motherboard (4X4 (4.09-in x 4.02-in x 1.4-in,
10.4 cm x 10.2 cm x 3.6 cm))

2
1.2 Specications
Form Factor Dimensions 4X4 (4.09-in x 4.02-in x 1.4-in, 10.4 cm x 10.2 cm x 3.6 cm)
Processor
System
CPU
AMD Ryzen™ 7040U-Series
AMD Ryzen™ 7 7840U (Max Speed up to 5.1GHz)
AMD Ryzen™ 5 7640U (Max Speed up to 4.9GHz)
BIOS AMI SPI 256 Mbit
Memory
Technology Dual Channel DDR5 5600 MHz
Capacity 64GB (32 GB per DIMM)
Socket 2 x 262-pin SO-DIMM
Graphics
Controller AMD Radeon™ Graphics
HDMI HDMI 1.4b
Max resolution up to 4096x2160@24Hz
DisplayPort DisplayPort 1.4a
Max resolution up to 4096x2160@60Hz
Multi Display Max 4 display (included 2 outputs from Type-C)
Expansion
Slot M.2 1 x M.2 (Key E, 2230) with PCIe Gen4 x1, USB 2.0 for
Wireless
Audio Interface Realtek ALC256, High Denition Audio
Ethernet
Controller/
Speed
LAN1: Realtek RTL8125BG with 10/100/1000/2500 Mbps
LAN2: Realtek RTL8111EPV with 10/100/1000 Mbps,
support DASH function
Controller 2 x RJ-45
Front I/O USB 1 x USB 3.2 Gen2 (Type-A)
2 x USB4 (Type-C, 5V/3A, supports DP1.4a display output)
Audio 1 (headphone & microphone jack)
Rear I/O
HDMI 2 x HDMI 1.4b
Ethernet 1 x 1 Gigabit LAN, 1 x 2.5 Gigabit LAN
USB 2 x USB 2.0
DC Jack 1
Storage M.2
1 x M.2 (Key M, 2242/2260/2280) with PCIe Gen4 x4 for
SSD
*M.2 Key M 2280 (supported by bracket)
SATA 1 x SATA3.0 (6.0 Gb/s)
Security TPM AMD FW TPM
Watchdog
Timer
Output From Super I/O to drag RESETCON#
Interval 256 Segments, 0, 1, 2, ...255sec

3
4X4-7840U-1U_4X4-7640U-1U
Power
Requirements
Input PWR 12V~19V DC-In Jack
Power On
AT/ATX supported
-AT: Directly PWR on as power input ready
-ATX: Press button to PWR on aer power input ready
Environment
Operating
Temp 0ºC ~ 70ºC
Storage Temp -40° C ~ 85° C
Operating
Humidity 5% ~ 90%
Storage
Humidity 5% ~ 90%

4
1.3 Motherboard Layout
5
1
3
2
4
Industrial
HDLED RESET
PLED PWRBTN
JP1
BIOS
ROM
AUDIO1
SATA3_1
1
1
PANEL1
1
LAN1
DDR5_B1 (Support DDR5 Only)
DDR5_ 1 (Support DDR5 Only)A
DC_IN1
USB 2.0:
T: USB2_6
B: USB2_7
HDMI1
HDMI2
LAN2
M2E_1
M.2 SSD
(M2M_1)
11
1
R
4X4-7840U
USB 4.0
(Type-C)
TC_U4_1
USB 4.0
(Type-C)
TC_U4_2
USB 3.2 Gen2
USB3_5
1 : M.2 Key-M Socket (M2M_1)
2 : M.2 Key-E Socket (M2E_1)
3 : SATA3 Port (SATA3_1)
4 : JP1
5 : System Panel Header (PANEL1)

5
4X4-7840U-1U_4X4-7640U-1U
PWR_BTN1
1
FAN1
BAT1
ESPI1
67
8
9
1
1
1
Backside :
6 : Power Button (PWR_BTN1)
7 : Fan Connector (FAN1)
8 : Battery Connector (BAT1)
9 : ESPI Connector (ESPI1)

6
1.4 I/O Panel
1 RJ45 LAN Port (LAN1)*
2 RJ45 LAN Port (LAN2)**
(supports DASH function)
3 HDMI Ports (HDMI1_2)
4 USB 2.0 Ports (USB2_6_7)
5 DC-In Jack (DC_IN1)
124
35
Activity/Link LED SPEED LED
* ere are two LEDs next to the LAN1 ports. Please refer to the table below for the
LAN1 port LED indications.
LAN1 Port LED Indications
Status Description
O No Link
Blinking Data Activity
On Link
Status Description
O 10Mbps connection
Orange 100Mbps connection
Green 2.5Gbps connection
ACT/LINK
LED
SPEED
LED
LAN1 Port
68
79
6 USB 4 Type-C Port (TC_U4_2)
7 USB 3.2 Gen2 Port (USB3_5)
8 USB 4 Type-C Port (TC_U4_1)
9 Audio Jack (AUDIO1)
Activity/Link LED SPEED LED
** ere are two LEDs next to the LAN2 ports. Please refer to the table below for the
LAN2 port LED indications.
LAN2 Port LED Indications
Status Description
O No Link
Blinking Data Activity
On Link
Status Description
O 10Mbps connection
Orange 100Mbps connection
Green 1Gbp connection
ACT/LINK
LED
SPEED
LED
LAN2 Port

7
4X4-7840U-1U_4X4-7640U-1U
1.5 Block Diagram
AMD
Phoenix
HDMI 1.4b
2 x HDMI
Connector
eSPI
HDMI 1.4b
1 x USB 3.2 Gen2
Connector
1 x USB 3.2 Gen2
Dual-RJ45
Connector
2.5G RTL8125BG PCIe x1
1G RTL8111EPV PCIe x1
Channel A DDR5 5600MHZ SO-DIMM
Line out & Mic in
Connector
Audio Realtek
ALC256
HDA
2 x USB 2.0
Connector
2 x USB 2.0
NUVOTON
NCT5525D-S
CPU FAN1 FAN
Channel B DDR5 5600MHZ SO-DIMM
PCIe Gen4 x4
M.2 Key M
USB 2.0
PCIE to SATA
Hub
ASM1061
PCIe Gen4 x1
PCIe Gen4 x1 M.2 Key E
SATA
SPI INFINEON
SLB9670XQ2.0
(BOM option)
1 x USB 2.0
Genesys
GL852
USB 2.0
USB 2.0
4X4-7840U
4X4-7640U
Typ e -C
Connector KB8002
USB4
Typ e -C
Connector KB8002
USB4
SATA Port
SPI BIOS
ROM
2 x USB 2.0
Header
(BOM option)
USB 2.0
MCU
NUC121
(BOM option)
COM 1
(BOM option)
RS232/422/485
USB4
USB4
SMBUS
4X4-7840U-1U
4X4-7640U-1U

8
Chapter 2 Installation
is is a 4X4 (4.09-in x 4.02-in x 1.4-in, 10.4 cm x 10.2 cm x 3.6 cm) form factor mother-
board. Before you install the motherboard, study the conguration of your chassis to ensure
that the motherboard ts into it.
2.1 Screw Holes
Place screws into the holes to secure the motherboard to the chassis.
2.2 Pre-installation Precautions
Take note of the following precautions before you install motherboard components or change
any motherboard settings.
1. Unplug the power cord from the wall socket before touching any component.
2. To avoid damaging the motherboard components due to static electricity, NEVER place
your motherboard directly on the carpet or the like. Also remember to use a grounded
wrist strap or touch a safety grounded object before you handle components.
3. Hold components by the edges and do not touch the ICs.
4. Whenever you uninstall any component, place it on a grounded antistatic pad or in the
bag that comes with the component.
5. Heatsink (e thermal solution of whole system needs to be designed additionally.)
Make sure to unplug the power cord before installing or removing the motherboard. Failure to
do so may cause physical injuries to you and damages to motherboard components.
Do not over-tighten the screws! Doing so may damage the motherboard.
Before you install or remove any component, ensure that the power is switched o or the
power cord is detached from the power supply. Failure to do so may cause severe damage to
the motherboard, peripherals, and/or components.

9
4X4-7840U-1U_4X4-7640U-1U
2.3 Installation of Memory Modules
4X4-7840U-1U / 4X4-7640U-1U provides two 262-pin DDR5 (Double Data Rate 5) SO-
DIMM slots, and supports Dual Channel Memory Technology.
e DIMM only ts in one correct orientation. It will cause permanent damage to the moth-
erboard and the DIMM if you force the DIMM into the slot in the incorrect orientation.
1. For dual channel conguration, you always need to install identical (the same brand,
speed, size and chip-type) DDR5 DIMM pairs.
2. It is unable to activate Dual Channel Memory Technology with only one memory
module installed.
3. It is not allowed to install a DDR, DDR2, DDR3 or DDR4 memory module into a
DDR5 slot; otherwise, this motherboard and DIMM may be damaged.
Step 1. Align a SO-DIMM on the slot such that the notch on the SO-DIMM matches the
break on the slot.
Step 2. Firmly insert the SO-DIMM into the slot until the retaining clips at both ends fully
snap back in place and the SO-DIMM is properly seated.

10
2.4 Expansion Slots
ere are 2 M.2 sockets on this motherboard.
M.2 sockets: 1 x M.2 (Key E, 2230) with PCIe Gen4 x1, USB 2.0 for Wireless
1 x M.2 (Key M, 2242/2260/2280) with PCIe Gen4 x4 for SSD
*M.2 Key M 2280 (supported by bracket)
M.2 Key-M Socket (M2M_1) M.2 Key-E Socket (M2E_1)
Pin Signal Name Signal Name Pin
1 GND +3.3V 2
3GND +3.3V 4
5PERn3 NA 6
7PERp3 NA 8
9GND LED 10
11 PETn3 +3.3V 12
13 PETp3 +3.3V 14
15 GND +3.3V 16
17 PERn2 +3.3V 18
19 PERp2 NA 20
21 GND NA 22
23 PETn2 NA 24
25 PETp2 NA 26
27 GND NA 28
29 PERn1 NA 30
31 PERp1 NA 32
33 GND USB_D+ 34
35 PETn1 USB_D- 36
37 PETp1 DEVSLP 38
39 GND SMB_CLK 40
41 PERn0 SMB_DATA 42
43 PERp0 NA 44
45 GND NA 46
47 PETn0 NA 48
49 PETP0 PERST# 50
51 GND CLKREQ# 52
53 PEFCLKn WAKE# 54
55 PEFCLKp NA 56
57 GND NA 58
67 NA NA 68
69 PEDET +3.3V 70
71 GND +3.3V 72
73 GND +3.3V 74
75 GND
Pin Signal Name Signal Name Pin
1 GND +3.3V 2
3USB_D+ +3.3V 4
5USB_D- NA 6
7GND NA 8
9NA NA 10
11 NA NA 12
13 NA NA 14
15 NA NA 16
17 NA GND 18
19 NA NA 20
21 NA NA 22
23 NA
NA 32
33 GND NA 34
35 PETp NA 36
37 PETn NA 38
39 GND NA 40
41 PERp NA 42
43 PERn NA 44
45 GND NA 46
47 PEFCLKp NA 48
49 PEFCLKn SUSCLK 50
51 GND PERST0# 52
53 CLKREQ# W_DISABLE1# 54
55 WAKE# W_DISABLE2# 56
57 GND SMB_DATA 58
59 NA SMB_CLK 60
61 NA NA 62
63 GND NA 64
65 NA NA 66
67 NA NA 68
69 GND NA 70
71 NA +3.3V 72
73 NA +3.3V 74
75 GND

11
4X4-7840U-1U_4X4-7640U-1U
2.5 Onboard Headers and Connectors
Onboard headers and connectors are NOT jumpers. Do NOT place jumper caps over these
headers and connectors. Placing jumper caps over the headers and connectors will cause per-
manent damage to the motherboard!
SATA3 Port
(7-pin SATA3_1)
(see p. 4, No. 3)
e Serial ATA3 (SATA3) connector supports SATA data cables for internal storage devices.
e current SATA3 interface allows up to 6.0 Gb/s data transfer rate.
Pin Signal Name
1 GND
2 R_SATA_TXP0
3 R_SATA_TXN0
4 GND
5 GND
6 R_SATA_RXN0
7 R_SATA_RXP0
8 GND
9 GND
10 GND
11 NC
12 +5V
13 +5V
14 +5V
15 +5V
16 +5V
17 NC
18 GND
19 GND
20 GND
1
20
JP1 Header
(8-pin JP1)
(see p. 4, No. 4)
1
7
2
8Pin Signal Name
JP1_12 SIO AT Mode
JP1_34 CMOS Normal
JP1_46 Clear CMOS
JP1_57 Reserved for AT mode
System Panel Header
(10-pin PANEL1)
(see p. 4, No. 5)
1 2
9 10
Pin Signal Name Signal Name Pin
1 HDLED+ PLED+ 2
3 HDLED- PLED- 4
5 GND PWRBTN# 6
7 RESET# GND 8
9 DUMMY 10

12
Battery Connector
(BAT1)
(see p. 5, No. 8)
BAT1
FAN Connector
(4-pin FAN1)
(see p. 5, No. 7)
2 1
Pin Signal Name
1+BAT
2 GND
Pin Signal Name
1 GND
2 +5V
3 FAN_SPEED
4 FAN_SPEED_CONTROL
Connect the power switch, reset switch and system status indicator on the chassis to this
header according to the pin assignments below. Note the positive and negative pins before
connecting the cables.
PWRBTN (Power Switch):
Connect to the power switch on the chassis front panel. You may congure the way to turn
o your system using the power switch.
RESET (Reset Switch):
Connect to the reset switch on the chassis front panel. Press the reset switch to restart the
computer if the computer freezes and fails to perform a normal restart.
PLED (System Power LED):
Connect to the power status indicator on the chassis front panel. e LED is on when the
system is operating. e LED keeps blinking when the system is in S3 sleep state. e LED
is o when the system is in S4 sleep state or powered o (S5).
HDLED (Hard Drive Activity LED):
Connect to the hard drive activity LED on the chassis front panel. e LED is on when the
hard drive is reading or writing data.
The front panel design may differ by chassis. A front panel module mainly consists of
power switch, reset switch, power LED, hard drive activity LED, speaker and etc. When
connecting your chassis front panel module to this header, make sure the wire assignments
and the pin assignments are matched correctly.
Backside :
Power Button
(PWR_BTN1)
(see p. 5, No. 6)
1
4 1

13
4X4-7840U-1U_4X4-7640U-1U
ESPI Connector
(20-pin ESPI1)
(see p. 5, No. 9)
e header is reserved for Port 80 code
display and debugging purposes.
120 Pin Signal Name
1 GND
2 ESPI_CLK
3 GND
4 ESPI_CS1#
5 ESPI_RESET#
6 GND
7 +3V
8 GND
9 SMB_CLK_MAIN_3V
10 SMB_DATA_MAIN_3V
11 ESPI_DAT0
12 ESPI_DAT1
13 ESPI_DAT2
14 ESPI_DAT3
15 GND
16 +3VSB
17 GPIO_TEST#
18 GND
19 ESPI_ALERT#
20 GND

14
Chapter 3 UEFI SETUP UTILITY
3.1 Introduction
ASRock Industrial UEFI (Unied Extensible Firmware Interface) is a BIOS utility which
oers tweak-friendly options in an advanced viewing interface. e UEFI system works
with a USB mouse and oers users a faster, sleeker experience.
is BIOS utility can perform the Power-On Self-Test (POST) during system startup, re-
cord hardware parameters of the system, load operating system, and so on. e battery on
the motherboard supplies the power needed to the CMOS when the system power is turned
o, and the values congured in the UEFI utility are kept in the CMOS.
Please note that inadequate BIOS settings may cause system instability, mulfunction or
boot failure. We strongly recommend that you do not alter the UEFI default congurations
or change the settings only with the assistance of a trained service person.
If the system becomes unstable or fails to boot aer you change the setting, try to clear
the CMOS values and reset the board to default values. See your motherboard manual for
instructions.
3.1.1 Entering BIOS Setup
You may run the UEFI SETUP UTILITY by pressing <F2> or <Delete> right aer you
power on the computer; otherwise, the Power-On-Self-Test (POST) will continue with
its test routines. If you wish to enter the UEFI SETUP UTILITY aer POST, restart the
system by pressing <Ctl> + <Alt> + <Delete>, or by pressing the reset button on the system
chassis. You may also restart by turning the system o and then back on.
is setup guide explains how to use the UEFI SETUP UTILITY to congure all
the supported system. e screenshots in this manual are for reference only. UEFI
Settings and options may vary owing to different BIOS release versions or CPU
installed. Please refer to the actual BIOS version of the motherboard you purchased
for detailed screens, settings and options.

15
4X4-7840U-1U_4X4-7640U-1U
3.1.2 UEFI Menu Bar
e top of the screen has a menu bar with the following selections:
Main For setting system time/date information
Advanced For advanced system congurations
H/W Monitor Displays current hardware status
Security For security settings
Boot For conguring boot settings and boot priority
Exit Exit the current screen or the UEFI Setup Utility
Because the UEFI soware is constantly being updated, the following UEFI setup
screens and descriptions for reference purpose only, and may vary from the latest
BIOS and do not exactly match what you see on your screen.