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ASRock B850M Pro RS WiFi AM5 micro-ATX motherboard, dark PCB with silver heatsinks

ASRock Open box

ASRock B850M Pro RS WiFi AM5 AMD motherboard

SKU CH-PP8H-DC6WM MPN B850M Pro RS WiFi

Micro-ATX AM5 board with PCIe 5.0 x16, Gen5 and Gen4 M.2 slots, 4 SATA ports, 7.1 audio and Dragon RTL8125BG 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)
  • Supports Ryzen 7000, 8000 and 9000 series CPUs via AM5 socket
  • 8+2+1 phase Dr.MOS power design delivers stable voltage to VCore, SOC and MISC
  • Four DDR5 slots support dual-channel up to 8000+ OC with EXPO and XMP 3.0
  • PCIe 5.0 x16 slot plus PCIe 4.0 x4 slot for GPU and expansion cards
  • One Blazing M.2 Gen5x4 and two Hyper M.2 Gen4x4 sockets plus four SATA 6Gb/s ports

AM5 Micro-ATX board for Ryzen 7000 8000 9000

This ASRock B850M Pro RS WiFi motherboard fits AM5 socket Ryzen 7000 8000 and 9000 series processors in a Micro-ATX form factor. It uses the AMD B850 chipset and an 8+2+1 phase Dr.MOS power design. Four DDR5 slots support up to 256 GB in dual channel with AMD EXPO and Intel XMP 3.0 profiles. ECC un-buffered memory is supported.

Who this suits and who should look elsewhere

Builders wanting a compact board with one PCIe 5.0 x16 slot and two PCIe 4.0 M.2 sockets will find the layout practical. The rear I/O includes HDMI DisplayPort 2.5 GbE LAN USB 3.2 Gen2 Type-C and Type-A plus Wi-Fi. Users needing more than one full-size PCIe 5.0 slot or more than three M.2 sockets should consider a full-size ATX alternative.

PCIe 5.0 M.2 decides the storage ceiling

The CPU-linked Blazing M.2 socket delivers PCIe Gen5 x4 bandwidth up to 128 Gb/s for a single 2280 NVMe drive. Two chipset Hyper M.2 sockets add PCIe Gen4 x4 at 64 Gb/s each. Four SATA 6 Gb/s ports and RAID 0 1 10 support round out the storage options. This Gen5 M.2 lane is the single spec that determines whether the board matches your fastest drive.

How it compares

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

Price $123.99
Cheaper than about 69% 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 RS 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 weight1.36 kg
Package size292 × 254 × 64 mm
Compatibility
Windows 11 supportWindows OS 10 64-bit / 11 64-bit
More details
BIOS256Mb AMI UEFI Legal BIOS with GUI support

Questions about this item

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

The board can run DDR5 memory up to 8000 MT/s when overclocked via AMD EXPO or Intel XMP 3.0 profiles, provided the installed Ryzen 7000, 8000 or 9000 series processor and memory modules support that speed.

How does the PCIe 5.0 x16 slot's speed change with different Ryzen series processors?

With Ryzen 9000 or 7000 series CPUs the slot runs at Gen5 x16; with Ryzen 8000 Phoenix 1 it drops to Gen4 x8; with Phoenix 2 it drops further to Gen4 x4.

What physical space and mounting points does this micro-ATX board need inside a case?

It fits a standard micro-ATX chassis with the usual nine mounting holes and uses the same I/O shield cut-out as other AM5 boards.

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