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ASRock B850M Pro-A WiFi micro-ATX motherboard, black PCB, silver heatsinks

ASRock

ASRock B850M Pro-A WiFi AMD motherboard

SKU CH-9KD1-Q8WYQ MPN B850M Pro-A WiFi

Micro-ATX AM5 board with 8+2+1 Dr.MOS power, DDR5 up to 8000+, PCIe 5.0 x16, Gen5 and Gen4 M.2 slots, 7.1 audio and Dragon 8125BG LAN

  • ProcessorRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
  • ChipsetAMD B850
  • Form factorMicro ATX
  • CPU socketAM5
  • Memory slot count4 × 288pin (DDR5)
  • Supported memoryUp to 8000+(OC)

Model B850M Pro-A WiFi

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  • Supports Ryzen 7000, 8000 and 9000 series processors on AM5 socket
  • 8+2+1 phase Dr.MOS power design delivers stable CPU voltage
  • Four DDR5 slots accept up to 256 GB at 8000+ MT/s OC
  • One PCIe 5.0 x16 slot plus one PCIe 4.0 x4 slot
  • Two M.2 sockets: one Gen5 x4 128 Gb/s and two Gen4 x4 64 Gb/s

AM5 Micro-ATX board for Ryzen 7000 8000 9000

This B850 chipset motherboard fits AM5 socket processors from the Ryzen 7000 8000 and 9000 families. It uses a 6 layer PCB with an 8+2+1 phase DrMOS power design and Hi-Density power connectors for stable delivery. Four DDR5 slots support up to 256 GB in dual channel with EXPO and XMP 3.0 profiles.

Suits builders who need Gen5 graphics and storage

The primary PCIe 5.0 x16 slot runs at Gen5 x16 with Ryzen 9000 and 7000 CPUs but drops to Gen4 x8 or Gen4 x4 with Ryzen 8000 series chips. One CPU linked M.2 socket delivers PCIe Gen5 x4 speeds while two chipset M.2 sockets provide Gen4 x4. Four SATA ports and SATA plus NVMe RAID support complete the storage options.

PCIe 5.0 x16 slot speed depends on CPU generation

With a Ryzen 9000 or 7000 processor the top slot operates at Gen5 x16 giving 128 Gb/s bandwidth to the graphics card. Ryzen 8000 Phoenix 1 CPUs limit it to Gen4 x8 and Phoenix 2 CPUs to Gen4 x4. Check your exact processor model before purchase to confirm the link speed you will receive.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $101.99
Cheaper than about 75% of the 1,906 comparable items (median $224.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameASRock
Model nameB850M PRO-A WIFI
Processor
ProcessorRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
CPU socketAM5
ChipsetAMD B850
Memory
Memory slot count4 × 288pin (DDR5)
Supported memoryUp to 8000+(OC)
Max supported RAM256 GB
Memory channelsDual Channel
Memory profilesAMD EXPO / Intel XMP 3.0
ECC supportYes
BufferingUn-buffered
Storage
SATA ports4 x SATA 6Gb/s
Audio & video
Audio chipRealtek ALC897
Sound channels7.1 Channels
Connectivity
Ethernet controllerDragon RTL8125BG
Maximum network speed2.5 Gbit/s
Wi-Fi standardWi-Fi 802.11 ax
Bluetooth support5.2
Ports & slots
PCIe 4.0 x16 slots1 x PCIe 4.0 x4 Slot (PCIE2), supports x4 mode*
Rear panel ports2 x Antenna Ports
1 x HDMI Port
1 x DisplayPort 1.4
1 x USB 3.2 Gen2 Type-A Port (10 Gb/s)
1 x USB 3.2 Gen2 Type-C Port
2 x USB 3.2 Gen1 Ports
4 x USB 2.0 Ports
1 x RJ-45 LAN Port
1 x BIOS Flashback Button
HD Audio Jacks: Line in / Front Speaker / Microphone
Onboard USB headers2 x USB 2.0 Headers (Support 4 USB 2.0 ports)
2 x USB 3.2 Gen1 Headers (Support 4 USB 3.2 Gen1 ports)
1 x Front Panel Type C USB 3.2 Gen1 Header
Power
Power connectors1 × 24 pin ATX Power Connector
1 × 8 pin 12 V Power Connector (Hi-Density Power Connector)
1 × 4 pin 12 V Power Connector (Hi-Density Power Connector)
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.6 in
Shipping weight1.23 kg
Package size305 × 269 × 66 mm
Compatibility
Windows 11 supportWindows OS 10 64-bit / 11 64-bit
In the box
In the box1 x I/O Shield
2 x SATA Data Cables
2 x ASRock WiFi 2.4/5/6 GHz Antennas
More details
BIOS256Mb AMI UEFI Legal BIOS with GUI support

Other versions of this model

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Questions about this item

Does the board ship with mounting screws for the three M.2 slots or do I need to buy them separately?

The motherboard includes the standoffs and screws required for the three onboard M.2 sockets, so no separate hardware is needed for installation.

Should I choose a Ryzen 7000, 8000 or 9000 series CPU to get the full PCIe 5.0 x16 and Gen5 M.2 bandwidth?

Ryzen 9000 and 7000 series processors run the primary PCIe 5.0 x16 slot at Gen5 x16 and the Blazing M.2 at Gen5 x4, while 8000 series CPUs limit the slot to Gen4 x8 or x4.

What does the 8000+(OC) DDR5 rating mean once the board is built into a working PC?

It indicates the maximum overclocked memory frequency the board can reach with AMD EXPO or Intel XMP 3.0 modules; actual speed depends on the CPU memory controller and cooling.

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