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ATX motherboard in dark finish with silver heatsinks, four DDR5 slots and rear I/O panel

ASRock

ASRock B850 Pro-A WiFi AMD motherboard

SKU CH-WE55-SER1T MPN B850 Pro-A WiFi

Socket AM5 ATX board for Ryzen 7000, 8000 and 9000 series with 14+2+1 power phases, DDR5 up to 8000, PCIe 5.0 M.2, Dragon RTL8125BG LAN and WiFi

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

Model B850 Pro-A WiFi

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  • Supports Ryzen 7000, 8000 and 9000 series CPUs on AM5 socket
  • 14+2+1 phase power design with 80A Dr.MOS for stable CPU delivery
  • Four DDR5 slots up to 8000+ OC and 256GB capacity with ECC
  • One PCIe 5.0 x16 slot plus one PCIe 4.0 x16 slot for graphics
  • 128 Gb/s Blazing M.2, two 64 Gb/s Hyper M.2, four SATA 6Gb/s

AM5 DDR5 Motherboard

The ASRock B850 Pro-A WiFi is an ATX motherboard built for AMD Socket AM5 processors. It accepts Ryzen 7000 Series, Ryzen 8000 Series and Ryzen 9000 Series CPUs. Four DDR5 DIMM slots support dual-channel memory up to 256GB and speeds of 8000+(OC) with AMD EXPO and Intel XMP 3.0 profiles. The board targets builders who want a stable platform for daily computing and gaming.

14+2+1 Power Phase Design

A 14+2+1 phase VRM uses 80A Dr.MOS power stages and Hi-Density power connectors to deliver clean current to the CPU. This layout improves thermal performance and supports higher overclocking headroom. Storage includes one PCIe Gen5x4 M.2 slot, two PCIe Gen4x4 M.2 slots, one PCIe Gen3x4 M.2 slot and four SATA 6Gb/s ports with RAID 0, 1 and 10 support. Rear I/O supplies USB 3.2 Gen2x2 Type-C, USB 3.2 Gen2 Type-C, USB 3.2 Gen1 Type-C, six USB 3.2 Gen1, nine USB 2.0, HDMI, USB Type-C with DP-alt, 7.1 audio and Dragon RTL8125BG LAN.

Builders Needing Gen5 Graphics And Fast Storage

This board suits users who need a PCIe 5.0 x16 slot for current graphics cards and multiple high-speed M.2 drives. It also fits workloads that benefit from ECC DDR5 memory. Buyers requiring more than one PCIe 5.0 x16 slot, additional rear display outputs or a different form factor should consider other models.

How it compares

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

Price $135.99
Cheaper than about 66% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASRock
Model nameB850 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
SATA and RAID supportSupports RAID 0 and RAID 1 for SATA storage devices
Supports RAID 0, RAID 1 and RAID 10 for M.2 NVMe storage devices
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 x16 Slot (PCIE2), supports x4 mode*
Rear panel ports2 x Antenna Ports
1 x HDMI Port
1 x USB 3.2 Gen2 Type-C Port (10 Gb/s)
1 x USB 3.2 Gen1 Type-C Port (DP-alt mode supports DP1.4a)
4 x USB 3.2 Gen1 Type-A Ports
6 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 3 USB 2.0 ports)
1 x USB 3.2 Gen1 Header (Supports 2 USB 3.2 Gen1 ports)
1 x Front Panel Type C USB 3.2 Gen2 × 2 Header (20 Gb/s)
Power
Power connectors1 × 24 pin ATX Power Connector
2 × 8 pin 12 V Power Connectors (Hi-Density Power Connector)
Size & build
Form factorATX
Width and length12.0 in × 9.6 in
Shipping weight1.77 kg
Package size345 × 279 × 76 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

Will the 14+2+1 phase 80A Dr.MOS VRM need any maintenance or replacement parts over time?

The VRM uses solid-state Dr.MOS power stages and premium chokes with no moving parts, so no scheduled maintenance or replacement components are required under normal operation.

What limit appears first when the 14+2+1 phase 80A Dr.MOS VRM runs sustained heavy loads?

The VRM thermal ceiling is the first limit; the 80A Dr.MOS stages and heatsink design set the maximum continuous current before throttling activates.

How much noise, heat and power draw does the 14+2+1 phase 80A Dr.MOS VRM add when the system runs all day?

The Dr.MOS integration reduces switching loss, so VRM heat stays low and the board relies on case airflow rather than active cooling, adding negligible noise and only the CPU's own power draw.

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