ASROCK B660M Pro RS/AX User manual

Version 1.0
Published April 2022
Copyright©2022 ASRock INC. All rights reserved.
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Specications and information contained in this documentation are furnished 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.
is equipment has been tested and found to comply with the limits for a Class B digital
device, pursuant to part 15 of the FCC Rules. ese limits are designed to provide
reasonable protection against harmful interference in a residential installation. is
equipment generates, uses and can radiate radio frequency energy and, if not installed
and used in accordance with the instructions, may cause harmful interference to radio
communications. However, there is no guarantee that interference will not occur in a
particular installation. If this equipment does cause harmful interference to radio or
television reception, which can be determined by turning the equipment o and on, the
user is encouraged to try to correct the interference by one or more of the following
measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
- Connect the equipment into an outlet on a circuit dierent from that to which the
receiver is connected.
- Consult the dealer or an experienced radio/TV technician for help.

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.
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IMPORTANT - READ BEFORE COPYING, INSTALLING OR USING.
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Licensee’s specic rights may vary from country to country.

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 ASRock Tel
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ASRock INC. hereby declares that this device is in compliance with the essential require-
ments and other relevant provisions of related UKCA Directives. Full text of UKCA decla-
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ASRock INC. hereby declares that this device is in compliance with the essential require-
ments and other relevant provisions of related Directives. Full text of EU declaration of
conformity is available at: http://www.asrock.com
ASRock follows the green design concept to design and manufacture our products, and
makes sure that each stage of the product life cycle of ASRock product is in line with global
environmental regulations. In addition, ASRock disclose the relevant information based
on regulation requirements.
Please refer to https://www.asrock.com/general/about.asp?cat=Responsibility for informa-
tion disclosure based on regulation requirements ASRock is complied with:
DO NOT throw the motherboard in municipal waste. is product has been
designed to enable proper reuse of parts and recycling. is 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.
CE Warning
is device complies with directive 2014/53/EU issued by the Commision of the
European Community.
is equipment complies with EU radiation exposure limits set forth for an
uncontrolled environment.
is equipment should be installed and operated with minimum distance 20cm
between the radiator & your body.

Operations in the 5.15-5.35GHz band are restricted to indoor usage only.
Radio transmit power per transceiver type
Function Frequency Maximum Output Power (EIRP)
WiFi
2400-2483.5 MHz 18.5 + / -1.5 dbm
5150-5250 MHz 21.5 + / -1.5 dbm
5250-5350 MHz 18.5 + / -1.5 dbm (no TPC)
21.5 + / -1.5 dbm (TPC)
5470-5725 MHz 25.5 + / -1.5 dbm (no TPC)
28.5 + / -1.5 dbm (TPC)
Bluetooth 2400-2483.5 MHz 8.5 + / -1.5 dbm

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B660M Pro RS/AX
Motherboard Layout
Intel
B660
ATXPWR1
HDLED RESET
PLED PWRBTN
PANEL1
1
1
1
2
CPU_FAN1
3
1
PCIE1
1
DDR4 _A2 (64 bit, 288-pi n module)
DDR4 _A1 (64 bit, 288-pi n module)
DDR4 _B2 (64 bit, 288-pi n module)
DDR4 _B1 (64 bit, 288-pin mo dule)
6
ATX12V1
USB3_5_6
CLRMOS1
1
1
HD_AUDIO1
Top:
RJ-45
CHA_FAN1/WP
PCIE3
8
9
4
USB_5_6
1
23
PCIE2
28
USB 3.2 Gen1
T: USB3_4
B: USB3_3
Top:
LINE IN
Center:
FRONT
Bottom:
MIC IN
USB2.0
T: USB_1
B: USB_2
PS2
Keyboard
/Mouse
1
ADDR_LED3
7
1
SPI_TPM_J1
T B1
1
ADDR_LED1
1
RGB_LED1
1
CHA_FAN3/WP
22
26
USB_3_4
CPU_FAN2/WP
11
12
SATA3_0
M2_2
USB 3.2 Gen1
T:
USB3_2
B: USB3_1
13
14
19 18 16
27
M2_1
CMOS
Battery
5
SATA3_2
SATA3_3
F_ US B3_ TC _1
10
SATA3_1
15
BIOS
ROM
24
CHA_FAN2/WP
21
SPK_CI1
1
20
HDMI1
LAN
AUDIO
CODECDRAM
CPU
VGA
BOOT
1
ADDR_LED2
17
DP1
25
M2_WIFI1
WiFi-802.11ax
Module

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No. Description
1 ATX 12V Power Connector (ATX12V1)
2 2 x 288-pin DDR4 DIMM Slots (DDR4_A1, DDR4_B1)
3 2 x 288-pin DDR4 DIMM Slots (DDR4_A2, DDR4_B2)
4 CPU Fan Connector (CPU_FAN1)
5 CPU/Water Pump Fan Connector (CPU_FAN2/WP)
6 Addressable LED Header (ADDR_LED2)
7 Addressable LED Header (ADDR_LED3)
8 ATX Power Connector (ATXPWR1)
9 USB 3.2 Gen1 Header (USB3_5_6)
10 Front Panel Type C USB 3.2 Gen1 Header (F_USB3_TC_1)
11 SATA3 Connector (SATA3_3)(Lower)
12 SATA3 Connector (SATA3_2)(Upper)
13 System Panel Header (PANEL1)
14 SATA3 Connector (SATA3_0)
15 SATA3 Connector (SATA3_1)
16 SPI TPM Header (SPI_TPM_J1)
17 Post Status Checker (PSC)
18 USB 2.0 Header (USB_5_6)
19 USB 2.0 Header (USB_3_4)
20 Chassis Intrusion and Speaker Header (SPK_CI1)
21 Chassis/Water Pump Fan Connector (CHA_FAN2/WP)
22 Chassis/Water Pump Fan Connector (CHA_FAN3/WP)
23 5-pin underbolt AIC Connector (TB1)
24 Clear CMOS Jumper (CLRMOS1)
25 Addressable LED Header (ADDR_LED1)
26 RGB LED Header (RGB_LED1)
27 Front Panel Audio Header (HD_AUDIO1)
28 Chassis/Water Pump Fan Connector (CHA_FAN1/WP)

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B660M Pro RS/AX
I/O Panel
No. Description No. Description
1 USB 2.0 Ports (USB_12) 7 USB 3.2 Gen1 Ports (USB3_1_2)
2 LAN RJ-45 Port* 8 Antenna Ports
3 Line In (Light Blue)** 9 DisplayPort 1.4
4 Front Speaker (Lime)** 10 HDMI Port
5 Microphone (Pink)** 11 PS/2 Mouse/Keyboard Port
6 USB 3.2 Gen1 Ports (USB3_3_4)
* ere are two LEDs on the 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
** 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
ACT/LINK LED
SPEED LED
LAN Port
11 569
10
42
3
1
78

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802.11ax Wi-Fi 6E Module and ASRock WiFi 2.4/5/6 GHz
Antennas
802.11ax Wi-Fi 6E + BT Module
is motherboard comes with an exclusive 802.11 a/b/g/n/ax Wi-Fi 6E + BT module
that oers support for 802.11 a/b/g/n/ax Wi-Fi 6E connectivity standards and
Bluetooth. Wi-Fi 6E + BT module is an easy-to-use wireless local area network
(WLAN) adapter to support Wi-Fi 6E + BT. Bluetooth standard features Smart
Ready technology that adds a whole new class of functionality into the mobile
devices. BT also includes Low Energy Technology and ensures extraordinary low
power consumption for PCs.
* e transmission speed may vary according to the environment.
* Wi-Fi 6E (6GHz band) will be supported by Microso® Windows® 11. e availability will
depend on the dierent regulation status of each country and region. It will be activated (for
supported countries) through Windows Update and soware updates once available.
* A 6GHz compatible router is required for 6E functionality.

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B660M Pro RS/AX
WiFi Antennas Installation Guide
Step 1
Prepare the WiFi 2.4/5/6 GHz Antennas that
come with the package.
Step 2
Connect the two WiFi 2.4/5/6 GHz Antennas
to the antenna connectors. Turn the antenna
clockwise until it is securely connected.
Step 3
Set the WiFi 2.4/5/6 GHz Antenna as shown in
the illustration.
*You may need to adjust the direction of
the antenna for a stronger signal.

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Chapter 1 Introduction
ank you for purchasing ASRock B660M Pro RS/AX 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 B660M Pro RS/AX Motherboard (Micro ATX Form Factor)
• ASRock B660M Pro RS/AX Quick Installation Guide
• ASRock B660M Pro RS/AX Support CD
• 2 x Serial ATA (SATA) Data Cables (Optional)
• 2 x ASRock WiFi 2.4/5/6 GHz Antennas (Optional)
• 2 x Screws for M.2 Sockets (Optional)
• 1 x Stando for M.2 Socket (Optional)
• 1 x I/O Panel Shield
Because the motherboard specications and the BIOS soware might be updated, the
content of this documentation will be subject to change without notice. In case any
modications of this documentation 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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B660M Pro RS/AX
1.2 Specications
Platform • Micro ATX Form Factor
• Solid Capacitor design
CPU • Supports 12th Gen Intel® CoreTM Processors (LGA1700)
• Digi Power design
• 8 Power Phase design
• Supports Intel® Hybrid Technology
• Supports Intel® Turbo Boost Max 3.0 Technology
Chipset • Intel® B660
Memory • Dual Channel DDR4 Memory Technology
• 4 x DDR4 DIMM Slots
• Supports DDR4 non-ECC, un-buered memory up to
5333+(OC)*
* Supports DDR4 3200 natively.
* Please refer to Memory Support List on ASRock's website for
more information. (http://www.asrock.com/)
• Supports ECC UDIMM memory modules (operate in non-
ECC mode)
• Max. capacity of system memory: 128GB
• Supports Intel® Extreme Memory Prole (XMP) 2.0
Expansion
Slot
Chipset:
• 1 x PCIe 4.0 x16 Slot (PCIE1), supports x16 mode*
• 1 x PCIe 3.0 x16 Slot (PCIE3), supports x4 mode*
• 1 x PCIe 3.0 x1 Slot (PCIE2)*
• 1 x M.2 Socket (Key E), supports type 2230 WiFi/BT PCIe
WiFi module and Intel® CNVi (Integrated WiFi/BT)
* Supports NVMe SSD as boot disks
• Supports AMD CrossFireTM
Graphics • Intel® UHD Graphics Built-in Visuals and the VGA outputs
can be supported only with processors which are GPU
integrated.
• Intel® XeGraphics Architecture (Gen 12)
• Dual graphics output: support HDMI and DisplayPort 1.4
ports by independent display controllers

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• Supports HDMI 2.1 TMDS Compatible with max. resolution
up to 4K x 2K (4096x2160) @ 60Hz
• Supports DisplayPort 1.4 with DSC (compressed) max.
resolution up to 8K (7680x4320) @ 60Hz / 5K (5120x3200) @
120Hz
• Supports HDCP 2.3 with HDMI 2.1 TMDS Compatible and
DisplayPort 1.4 Ports
Audio • 7.1 CH HD Audio (Realtek ALC897 Audio Codec)
• Supports Surge Protection
• Nahimic Audio
LAN • Gigabit LAN 10/100/1000 Mb/s
• Giga PHY Intel® I219V
• Supports Wake-On-LAN
• Supports Lightning/ESD Protection
• Supports Energy Ecient Ethernet 802.3az
• Supports UEFI PXE
Wireless
LAN
• 802.11ax Wi-Fi 6E Module
• Supports IEEE 802.11a/b/g/n/ax
• Supports Dual-Band 2x2 160MHz with extended 6GHz
band* support
* Wi-Fi 6E (6GHz band) will be supported by Microso®
Windows® 11. e availability will depend on the dierent
regulation status of each country and region.
It will be activated (for supported countries) through
Windows Update and soware updates once available.
* A 6GHz compatible router is required for 6E functionality.
• 2 antennas to support 2 (Transmit) x 2 (Receive) diversity
technology
• Supports Bluetooth + High speed class II
• Supports MU-MIMO
Rear Panel
I/O
• 2 x Antenna Ports
• 1 x PS/2 Mouse/Keyboard Port
• 1 x HDMI Port
• 1 x DisplayPort 1.4
• 4 x USB 3.2 Gen1 Ports (ASMedia ASM1074 hub) (Supports
ESD Protection)

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B660M Pro RS/AX
• 2 x USB 2.0 Ports (Supports ESD Protection)
• 1 x RJ-45 LAN Port with LED (ACT/LINK LED and SPEED
LED)
• HD Audio Jacks: Line in / Front Speaker / Microphone
Storage CPU:
• 1 x Hyper M.2 Socket (M2_1, Key M), supports type
2242/2260/2280 PCIe Gen4x4 (64 Gb/s) mode*
Chipset:
• 1 x Ultra M.2 Socket (M2_2, Key M), supports type 2280
SATA3 6.0 Gb/s & PCIe Gen3x4 (32 Gb/s) modes*
• 4 x SATA3 6.0 Gb/s Connectors**
* Supports Intel® OptaneTM Technology (M2_2 only)
* Supports Intel® Volume Management Device (VMD)
* Supports NVMe SSD as boot disks
* Supports ASRock U.2 Kit
** If M2_2 is occupied by a SATA-type M.2 device, SATA3_0
will be disabled.
RAID • Supports RAID 0, RAID 1, RAID 5 and RAID 10 for SATA
storage devices
Connector • 1 x SPI TPM Header
• 1 x Chassis Intrusion and Speaker Header
• 1 x RGB LED Header
* Supports in total up to 12V/3A, 36W LED Strip
• 3 x Addressable LED Headers
* Support in total up to 5V/3A, 15W LED Strip
• 1 x CPU Fan Connector (4-pin)
* e CPU Fan Connector supports the CPU fan of maximum
1A (12W) fan power.
• 1 x CPU/Water Pump Fan Connector (4-pin) (Smart Fan
Speed Control)
* e CPU/Water Pump Fan supports the water cooler fan of
maximum 2A (24W) fan power.
• 3 x Chassis/Water Pump Fan Connectors (4-pin) (Smart Fan
Speed Control)

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* e Chassis/Water Pump Fan supports the water cooler fan of
maximum 2A (24W) fan power.
* CPU_FAN2/WP, CHA_FAN1~3/WP 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 (Hi-Density Power
Connector)
• 1 x Front Panel Audio Connector
• 1 x underbolt AIC Connector (5-pin) (Supports ASRock
underbolt 4 AIC Card)
• 2 x USB 2.0 Headers (Support 4 USB 2.0 ports) (Supports
ESD Protection)
• 1 x USB 3.2 Gen1 Header (Supports 2 USB 3.2 Gen1 ports)
(Supports ESD Protection)
• 1 x Front Panel Type C USB 3.2 Gen1 Header (Supports ESD
Protection)
BIOS
Feature
• AMI UEFI Legal BIOS with multilingual GUI support
• ACPI 6.0 Compliant wake up events
• SMBIOS 2.7 Support
• CPU Core/Cache, CPU GT, DRAM, VDD_IMC, VCCIN
AUX, +1.05V PROC, +0.82V PCH , +1.05V PCH Voltage
Multi-adjustment
Hardware
Monitor
• Fan Tachometer: CPU, CPU/Water Pump, Chassis/Water
Pump Fans
• Quiet Fan (Auto adjust chassis fan speed by CPU tempera-
ture): CPU, CPU/Water Pump, Chassis/Water Pump Fans
• Fan Multi-Speed Control: CPU, CPU/Water Pump, Chassis/
Water Pump Fans
• CASE OPEN detection
• Voltage monitoring: CPU Vcore, +1.05V_PCH, DRAM, VC-
CIN AUX, +1.05V PROC, VCCSA, +0.82V PCH, +12V, +5V,
+3.3V
OS • Microso® Windows® 10 64-bit / 11 64-bit

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B660M Pro RS/AX
* For detailed product information, please visit our website: http://www.asrock.com
Certica-
tions
• FCC, CE
• ErP/EuP Ready (ErP/EuP ready power supply is required)
Please realize that there is a certain risk involved with overclocking, including
adjusting 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.

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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
components. Failure to do so may cause physical injuries 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

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B660M Pro RS/AX
2.1 Installing the CPU
1. Before you insert the 1700-Pin CPU into the socket, please check if the PnP cap is on the
socket, if the CPU surface is unclean, or if there are any bent pins in the socket. Do not
force to insert the CPU into the socket if above situation is found. Otherwise, the CPU
will be seriously damaged.
2. Unplug all power cables before installing the CPU.
1
A
B
2 3

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5
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English
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B660M Pro RS/AX
Please save and replace the cover if the processor is removed. e cover must be placed if
you wish to return the motherboard for aer service.