ASROCK X370M Pro4 R2.0 User manual

Version 1.0
Published November 2018
Copyright©2018 ASRock INC. All rights reserved.
Copyright Notice:
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ASRock 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 ASRock. ASRock assumes no responsibility for
any errors or omissions that may appear in this documentation.
With respect to the contents of this documentation, ASRock 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
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In no event shall ASRock, its directors, ocers, employees, or agents be liable for
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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 Website: http://www.asrock.com

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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.

1
English
X370M Pro4 R2.0
AB350M Pro4 R2.0
A320M Pro4 R2.0
Motherboard Layout
BIOS
ROM
ATXPWR1
Super
I/O
CLR CMO S1
1
PCIE2
1
USB _2_ 3
HD_AUDIO1
1
CPU _FA N1
Top:
LIN E IN
Cen te r:
FRO NT
Bot to m:
MIC I N
RJ-45 LAN
USB 2.0
T: USB1
B: USB2
SOCKET AM4
1
COM 1
CMOS
Battery
ATX1 2V 1
USB 3 .1 Gen1
USB 31 _TC _1
M2_1
Ul t r a M.2
PC Ie G e n3 x 4
USB 3_ 3_ 4
1
CHA_FAN1
CHA_FAN2
HDLE D RES ET
PLED P WRB TN
PANE L1
1
RoHS
SPK_PLED1
1
DDR4_A1 (64 bit, 288 -pin mod ule)
DDR4_A2 (64 bit, 288 -pin mod ule)
DDR4_B1 (64 bit, 288 -pin mod ule)
DDR4_B2 (64 bit, 288 -pin mod ule)
PCIE1
PCIE3
M2_2
M2_2_CT2M2_2_CT3M2_2_CT4 M2_2_CT1
AMD
Promontory
X370 /
B350 / A320
PS2
Keyb oar d
PS2
Mous e
USB 3. 1 Gen 1
T: USB2
B: USB 3
USB 3. 1 Gen 1
T: USB4
B: USB 5
RGB_HEADER1
1
AMD_ FAN_ LED 1
1
USB_ 5
1
M2_ 1_ CT3M2_1_ CT2M2_ 1_ CT1
1
USB _2_ 4
TPM S1
1
SATA3 _3
SATA3 _4
SATA3 _1
SATA3 _2
HDMI1
DVI1
VGA1

English
2
No. Description
1 ATX 12V Power Connector (ATX12V1)
2 CPU Fan Connector (CPU_FAN1)
3 2 x 288-pin DDR4 DIMM Slots (DDR4_A1, DDR4_B1)
4 2 x 288-pin DDR4 DIMM Slots (DDR4_A2, DDR4_B2)
5 RGB LED Header (RGB_HEADER1)
6 AMD Fan LED Header (AMD_FAN_LED1)
7 ATX Power Connector (ATXPWR1)
8 USB 3.1 Gen1 Header (USB3_3_4)
9* AMD LED Fan USB Header (USB_5) (for X370M Pro4 R2.0 / AB350M Pro4 R2.0 only)
10 SATA3 Connector (SATA3_3)
11 SATA3 Connector (SATA3_4)
12 SATA3 Connector (SATA3_2)
13 SATA3 Connector (SATA3_1)
14 System Panel Header (PANEL1)
15 Power LED and Speaker Header (SPK_PLED1)
16 Chassis Fan Connector (CHA_FAN2)
17 USB 2.0 Header (USB_2_3)
18 USB 2.0 Header (USB_2_4)
19 Clear CMOS Jumper (CLRCMOS1)
20 COM Port Header (COM1)
21 TPM Header (TPMS1)
22 Front Panel Audio Header (HD_AUDIO1)
23 Chassis Fan Connector (CHA_FAN1)

3
English
X370M Pro4 R2.0
AB350M Pro4 R2.0
A320M Pro4 R2.0
I/O Panel
No. Description No. Description
1 PS/2 Mouse Port 8 USB 3.1 Gen1 Ports (USB3_23)
2 DVI-D Port 9 USB 3.1 Gen1 Type-C Port (USB31_TC_1)
3 LAN RJ-45 Port* 10 HDMI Port
4 Line In (Light Blue)** 11 D-Sub Port
5 Front Speaker (Lime)** 12 USB 2.0 Ports (USB_1_2)
6 Microphone (Pink)** 13 PS/2 Keyboard Port
7 USB 3.1 Gen1 Ports (USB3_45)
* ere are two LEDs on each LAN port. Please refer to the table below for the LAN port LED indications.
Activity / Link LED Speed LED
Status Description Status Description
O No Link O 10Mbps connection
Blinking Data Activity Orange 100Mbps connection
On Link Green 1Gbps connection
ACT/LINK LED
SPEED LED
LAN Port
1
8 7913 12
3
6
5
4
10
2
11

English
4
** To congure 7.1 CH HD Audio, it is required to use an HD front panel audio module and enable the multi-
channel audio feature through the audio driver.
Please set Speaker Conguration to “7.1 Speaker”in the Realtek HD Audio Manager.
Function of the Audio Ports in 7.1-channel Conguration:
Port Function
Light Blue (Rear panel) Rear Speaker Out
Lime (Rear panel) Front Speaker Out
Pink (Rear panel) Central /Subwoofer Speaker Out
Lime (Front panel) Side Speaker Out

5
English
X370M Pro4 R2.0
AB350M Pro4 R2.0
A320M Pro4 R2.0
Chapter 1 Introduction
ank you for purchasing ASRock X370M Pro4 R2.0 / AB350M Pro4 R2.0 /
A320M Pro4 R2.0 motherboard, a reliable motherboard produced under ASRock’s
consistently stringent quality control. It delivers excellent performance with robust
design conforming to ASRock’s commitment to quality and endurance.
1.1 Package Contents
• ASRock X370M Pro4 R2.0 / AB350M Pro4 R2.0 / A320M Pro4 R2.0 Motherboard
(Micro ATX Form Factor)
• ASRock X370M Pro4 R2.0 / AB350M Pro4 R2.0 / A320M Pro4 R2.0 Quick Installation
Guide
• ASRock X370M Pro4 R2.0 / AB350M Pro4 R2.0 / A320M Pro4 R2.0 Support CD
• 1 x I/O Panel Shield
• 2 x Serial ATA (SATA) Data Cables (Optional)
• 2 x Screws for M.2 Sockets (Optional)
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 ASRock’s website
without further notice. If you require technical support related to this motherboard,
please visit our website for specic information about the model you are using. You
may nd the latest VGA cards and CPU support list on ASRock’s website as well.
ASRock website http://www.asrock.com.

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6
1.2 Specications
Platform • Micro ATX Form Factor
• Solid Capacitor design
CPU • Supports AMD Socket AM4 A-Series APUs (Bristol Ridge)
and Ryzen Series CPUs (Summit Ridge, Raven Ridge and
Pinnacle Ridge
• Digi Power design
• 9 Power Phase design
• Supports 105W Water Cooling (Pinnacle Ridge); Supports
95W Water Cooling (Summit Ridge); Supports 65W Water
Cooling (Raven Ridge)
Chipset • AMD Promontory X370 (X370M Pro4 R2.0)
• AMD Promontory B350 (AB350M Pro4 R2.0)
• AMD Promontory A320 (A320M Pro4 R2.0)
Memory • Dual Channel DDR4 Memory Technology
• 4 x DDR4 DIMM Slots
• AMD Ryzen series CPUs (Pinnacle Ridge) support DDR4
3200+(OC)/2933(OC)/2667/2400/2133 ECC & non-ECC, un-
buered memory*
• AMD Ryzen series CPUs (Summit Ridge) support DDR4
3200+(OC)/2933(OC)/2667/2400/2133 ECC & non-ECC, un-
buered memory*
• AMD Ryzen series CPUs (Raven Ridge) support DDR4
3200+(OC)/2933/2667/2400/2133 non-ECC, un-buered
memory*
• AMD 7th Gen A-Series APUs support DDR4 2400/2133 non-
ECC, un-buered memory*
* For Ryzen Series CPUs (Raven Ridge), ECC is only supported
with PRO CPUs.
* Please refer to Memory Support List on ASRock’s website for
more information. (http://www.asrock.com/)
* Please refer to page 23 for DDR4 UDIMM maximum frequency
support.
• Max. capacity of system memory: 64GB
• 15μ Gold Contact in DIMM Slots

7
English
X370M Pro4 R2.0
AB350M Pro4 R2.0
A320M Pro4 R2.0
Expansion
Slot
(X370M
Pro4 R2.0
/ AB350M
Pro4 R2.0)
AMD Ryzen series CPUs (Summit Ridge and Pinnacle Ridge)
• 1 x PCI Express 3.0 x16 Slot (PCIE2: x16 mode)*
• 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode)
AMD 7th A-Series APUs
• 1 x PCI Express 3.0 x16 Slot (PCIE2: x8 mode)*
• 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode)
AMD Ryzen series CPUs (Raven Ridge)
• 1 x PCI Express 3.0 x16 Slot (PCIE2: x8 mode) (If you use
Athlon 2xxGE series APU, PCIE2 slot will run at x4 mode.)*
• 1 x PCI Express 2.0 x16 Slot (PCIE3: x4 mode)
* Supports NVMe SSD as boot disks
• 1 x PCI Express 2.0 x1 Slot
• Supports AMD Quad CrossFireXTM and CrossFireXTM
Expansion
Slot
(A320M
Pro4 R2.0)
AMD Ryzen series CPUs (Summit Ridge and Pinnacle Ridge)
• 1 x PCI Express 3.0 x16 Slot (PCIE2: x16 mode)*
• 1 x PCI Express 2.0 x16 Slot (PCIE3: x2 mode)
AMD 7th A-Series APUs
• 1 x PCI Express 3.0 x16 Slot (PCIE2: x8 mode)*
• 1 x PCI Express 2.0 x16 Slot (PCIE3: x2 mode)
AMD Ryzen series CPUs (Raven Ridge)
• 1 x PCI Express 3.0 x16 Slot (PCIE2: x8 mode) (If you use
Athlon 2xxGE series APU, PCIE2 slot will run at x4 mode.)*
• 1 x PCI Express 2.0 x16 Slot (PCIE3: x2 mode)
* Supports NVMe SSD as boot disks
• 1 x PCI Express 2.0 x1 Slot
Graphics • Integrated AMD RadeonTM Vega Series Graphics in Ryzen
Series APU*
• Integrated AMD RadeonTM R-Series Graphics in A-series
APU*
* Actual support may vary by CPU
• DirectX 12, Pixel Shader 5.0
• Shared memory default 2GB. Max Shared memory supports
up to 16GB.
* e Max shared memory 16GB requires 32GB system memory
installed.
• ree graphics output options: D-Sub, DVI-D and HDMI

English
8
• Supports Triple Monitor
• Supports HDMI with max. resolution up to 4K x 2K
(4096x2160) @ 24Hz / (3840x2160) @ 30Hz
• Supports DVI-D with max. resolution up to 1920x1200 @
60Hz
• Supports D-Sub with max. resolution up to 1920x1200 @
60Hz
• Supports Auto Lip Sync, Deep Color (12bpc), xvYCC and
HBR (High Bit Rate Audio) with HDMI Port (Compliant
HDMI monitor is required)
• Supports HDCP with DVI-D and HDMI Ports
• Supports Full HD 1080p Blu-ray (BD) playback with DVI-D
and HDMI Ports
Audio • 7.1 CH HD Audio with Content Protection (Realtek ALC892
Audio Codec)
* To congure 7.1 CH HD Audio, it is required to use an HD
front panel audio module and enable the multi-channel audio
feature through the audio driver.
• Premium Blu-ray Audio support
• Supports Surge Protection
• ELNA Audio Caps
LAN • PCIE x1 Gigabit LAN 10/100/1000 Mb/s
• Realtek RTL8111GR
• Supports Wake-On-LAN
• Supports Lightning/ESD Protection
• Supports LAN Cable Detection
• Supports Energy Ecient Ethernet 802.3az
• Supports PXE
Rear Panel
I/O
• 1 x PS/2 Mouse Port
• 1 x PS/2 Keyboard Port
• 1 x D-Sub Port
• 1 x DVI-D Port
• 1 x HDMI Port
• 2 x USB 2.0 Ports (Supports ESD Protection)
• 1 x USB 3.1 Gen1 Type-C Port (Supports ESD Protection)
• 4 x USB 3.1 Gen1 Ports (Supports ESD Protection)

9
English
X370M Pro4 R2.0
AB350M Pro4 R2.0
A320M Pro4 R2.0
• 1 x RJ-45 LAN Port with LED (ACT/LINK LED and SPEED
LED)
• HD Audio Jacks: Line in / Front Speaker / Microphone
Storage • 4 x SATA3 6.0 Gb/s Connectors, support RAID (RAID 0,
RAID 1 and RAID 10), NCQ, AHCI and Hot Plug*
* M2_2 and SATA3_3 share lanes. If either one of them is in use,
the other one will be disabled.
• 1 x Ultra M.2 Socket (M2_1), supports M Key type
2242/2260/2280 M.2 PCI Express module up to Gen3 x4 (32
Gb/s) (with Summit Ridge, Raven Ridge and Pinnacle Ridge)
or Gen3 x2 (16 Gb/s) (with A-Series APU and Athlon 2xxGE
series APU)**
• 1 x M.2 Socket (M2_2), supports M Key type
2230/2242/2260/2280 M.2 SATA3 6.0 Gb/s module**
** Supports NVMe SSD as boot disks
** Supports ASRock U.2 Kit
Connector • 1 x COM Port Header
• 1 x TPM Header
• 1 x Power LED and Speaker Header
• 1 x RGB LED Header
* Supports in total up to 12V/3A, 36W LED Strip
• 1 x AMD Fan LED Header
* e AMD Fan LED Header supports LED strips of maximum
load of 3A (36W) and length up to 2.5M.
• 1 x CPU Fan Connector (4-pin)
* e CPU Fan Connector supports the CPU fan of maximum
1A (12W) fan power.
• 2 x Chassis Fan Connectors (1 x 4-pin, 1 x 3-pin) (Smart Fan
Speed Control)
* CHA_FAN1 can auto detect if 3-pin or 4-pin fan is in use.
• 1 x 24 pin ATX Power Connector
• 1 x 8 pin 12V Power Connector
• 1 x Front Panel Audio Connector
• 1 x AMD LED Fan USB Header (for X370M Pro4 R2.0 /
AB350M Pro4 R2.0 only)
• 2 x USB 2.0 Headers (Support 4 USB 2.0 ports) (Supports ESD
Protection)
• 1 x USB 3.1 Gen1 Header (Supports 2 USB 3.1 Gen1 ports)
(Supports ESD Protection)

English
10
BIOS
Feature
• AMI UEFI Legal BIOS with multilingual GUI support
• Supports “Plug and Play”
• ACPI 5.1 compliance wake up events
• Supports jumperfree
• SMBIOS 2.3 support
• DRAM Voltage multi-adjustment
Hardware
Monitor
• CPU/Chassis temperature sensing
• CPU/Chassis Fan Tachometer
• CPU/Chassis Quiet Fan
• CPU/Chassis Fan multi-speed control
• Voltage monitoring: +12V, +5V, +3.3V, Vcore
OS • Microso® Windows® 10 64-bit
Certica-
tions
• FCC, CE
• ErP/EuP ready (ErP/EuP ready power supply is required)
* For detailed product information, please visit our website: http://www.asrock.com
Please realize that there is a certain risk involved with overclocking, including adjust-
ing the setting in the BIOS, applying Untied Overclocking Technology, or using third-
party overclocking tools. Overclocking may aect your system’s stability, or even cause
damage to the components and devices of your system. It should be done at your own
risk and expense. We are not responsible for possible damage caused by overclocking.

11
English
X370M Pro4 R2.0
AB350M Pro4 R2.0
A320M Pro4 R2.0
is is a Micro ATX form factor motherboard. Before you install the motherboard,
study the conguration of your chassis to ensure that the motherboard ts into it.
Pre-installation Precautions
Take note of the following precautions before you install motherboard components
or change any motherboard settings.
• 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.
• In order to avoid damage from static electricity to the motherboard’s components,
NEVER place your motherboard directly on a carpet. Also remember to use a grounded
wrist strap or touch a safety grounded object before you handle the components.
• Hold components by the edges and do not touch the ICs.
• Whenever you uninstall any components, place them on a grounded anti-static pad or
in the bag that comes with the components.
• When placing screws to secure the motherboard to the chassis, please do not over-
tighten the screws! Doing so may damage the motherboard.
Chapter 2 Installation

English
12
2.1 Installing the CPU
Unplug all power cables before installing the CPU.
2
1

13
English
X370M Pro4 R2.0
AB350M Pro4 R2.0
A320M Pro4 R2.0
3

English
14
2.2 Installing the CPU Fan and Heatsink
Aer you install the CPU into this motherboard, it is necessary to install a larger
heatsink and cooling fan to dissipate heat. You also need to spray thermal grease
between the CPU and the heatsink to improve heat dissipation. Make sure that the
CPU and the heatsink are securely fastened and in good contact with each other.
Installing the CPU Box Cooler SR1
Please turn o the power or remove the power cord before changing a CPU or heatsink.
1
2

15
English
X370M Pro4 R2.0
AB350M Pro4 R2.0
A320M Pro4 R2.0
3
4
CPU_FAN1

English
16
Installing the AM4 Box Cooler SR2
1
2

17
English
X370M Pro4 R2.0
AB350M Pro4 R2.0
A320M Pro4 R2.0
3

English
18
4-pin FAN cable
RGB LED Cable
+12V
*e diagram shown here are for reference only. Please refer to page 32 for the orientation of
AMD Fan LED Header (AMD_FAN_LED1).
5
CPU_FAN1
AMD_FAN_LED1
4
CPU_FAN1