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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

  • CPU Socket TypeAM5
  • CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
  • ChipsetAMD B850
  • Number of Memory Slots4x288pin (DDR5)
  • Memory StandardUp to 8000+(OC)
  • Maximum Memory Supported256GB

Option B850 Pro-A WiFi

Struck-through versions exist but are not stocked here.

  • 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.

Highlights

  • 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

Specifications

BrandASRock
ModelB850 PRO-A WIFI
CPU Socket TypeAM5
CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Memory StandardUp to 8000+(OC)
Maximum Memory Supported256GB
Channel SupportedDual Channel
Memory Performance ProfileAMD EXPO / Intel XMP 3.0
ECC SupportedYes
Buffer SupportedUn-buffered
PCI Express 5.0 x161 x PCIe 5.0 x16 Slot (PCIE1), supports x16 mode*
* PCIE1 will run at Gen5x16 with 9000 and 7000 series processors, Gen4x8 with 8000 (Phoenix 1) series processors and Gen4x4 with 8000 (Phoenix 2) series processors.
* If M2_3 is occupied, PCIE2 will be disabled.
* Supports NVMe SSD as boot disks
- 15µ Gold Contact in VGA PCIe Slot (PCIE1)
PCI Express 4.0 x161 x PCIe 4.0 x16 Slot (PCIE2), supports x4 mode*
Serial ATA (SATA)4 x SATA 6Gb/s
M.2CPU:
- 1 x Blazing M.2 Socket (M2_1, Key M), supports type 2280 PCIe Gen5x4 (128 Gb/s) mode*
- 1 x Hyper M.2 Socket (M2_2, Key M), supports type 2280 PCIe Gen4x4 (64 Gb/s) mode*
Chipset:
- 1 x Hyper M.2 Socket (M2_3, Key M), supports type 2230/2242/2260/2280 PCIe Gen4x4
(64 Gb/s) mode*
- 1 x Ultra M.2 Socket (M2_4, Key M), supports type 2280 PCIe Gen3x4 (32 Gb/s) mode*
* Supports NVMe SSD as boot disks
* M2_1 is the first priority for M.2 installation.
* M2_1 will run at Gen5x4 with 9000 and 7000 series processors and Gen4x4 with 8000 (Phoenix 1 and Phoenix 2) series processors.
* M2
SATA RAIDSupports RAID 0 and RAID 1 for SATA storage devices
Supports RAID 0, RAID 1 and RAID 10 for M.2 NVMe storage devices
Audio ChipsetRealtek ALC897
Audio Channels7.1 Channels
LAN ChipsetDragon RTL8125BG
Max LAN Speed2.5Gbps
Wireless LANWi-Fi 802.11 ax
BluetoothBluetooth 5.2
Back I/O 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 USB2 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 Gen2x2 Header (20 Gb/s)
Other Connectors1 x SPI TPM Header
1 x Power LED and Speaker Header
1 x RGB LED Header*
3 x Addressable LED Headers**
2 x CPU Fan Connectors (4-pin) (Smart Fan Speed Control)***
4 x Chassis Fan Connectors (4-pin) (Smart Fan Speed Control)***
1 x AIO Pump Fan Connector (4-pin) (Smart Fan Speed Control)***
1 x Front Panel Audio Connector
* Supports in total up to 12V/3A, 36W LED Strip
** Support in total up to 5V/3A, 15W LED Strip
*** CPU_FAN1 supports the fan power up to 1A (12W).
*** CPU_FAN2, CHA_FAN1~4 and AIO_PUMP support the fan power up to 3A (36W).
*** CPU_FAN2, CHA_FAN1~4 and AIO_PUMP can aut
Form FactorATX
Dimensions (W x L)12.0" x 9.6"
Power Pin1 x 24 pin ATX Power Connector
2 x 8 pin 12V Power Connectors (Hi-Density Power Connector)
BIOS Feature256Mb AMI UEFI Legal BIOS with GUI support
SoftwareSoftware
- ASRock Motherboard Utility (A-Tuning)
- ASRock Dragon 2.5G LAN Software
- ASRock Polychrome SYNC
* These utilities can be downloaded from ASRock Live Update & APP Shop.
UEFI
- ASRock EZ Mode
- ASRock Full HD UEFI
- ASRock Auto Driver Installer
- ASRock Instant Flash
Windows 11Windows OS 10 64-bit / 11 64-bit
FeaturesSuperb Productivity
- PCIe Gen5 (Graphics, M.2)
- Dual Channel DDR5
Rock-Solid Durability
- 14+2+1 Power Phase, 80A Dr.MOS for VCore+SOC+MISC
Ultrafast Connectivity
- 2.5G LAN, 802.11axe Wi-Fi 6E Module
EZ Update
- BIOS Flashback Button
- ASRock Auto Driver Installer
EZ Troubleshooter
- ASRock Post Status Checker
Package Contents1 x I/O Shield
2 x SATA Data Cables
2 x ASRock WiFi 2.4/5/6 GHz Antennas
Shipping weight1.77 kg
Package size345 × 279 × 76 mm

Other versions of this model

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

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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