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White ATX motherboard with silver heatsinks and black PCB

ASUS

ASUS ROG STRIX B850-A GAMING WIFI AMD motherboard

SKU CH-1J51-7659Y MPN ROG STRIX B850-A GAMING WIFI

ATX board for Ryzen 7000, 8000 and 9000 CPUs with 14+2+2 power stages, DDR5 to 8000 MT/s, WiFi 7, 2.5G LAN, one PCIe 5.0 M.2 and three PCIe 4.0 M.2 slots, plus USB 20Gbps Type-C

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

Model ROG STRIX B850-A GAMING WIFI

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  • Supports Ryzen 7000, 8000 and 9000 series processors with AM5 socket
  • 14+2+2 power stages rated for 80A deliver stable multi-core performance
  • Four DDR5 slots up to 8000 MT/s and 192GB with EXPO and AEMP
  • One PCIe 5.0 plus three PCIe 4.0 M.2 slots with heatsinks
  • 5G LAN, WiFi 7 with Q-Antenna, USB 20Gbps Type-C and AI Networking II

AM5 socket for Ryzen 7000 8000 9000

The ROG STRIX B850-A GAMING WIFI is an ATX motherboard built around the AMD B850 chipset and AM5 socket. It supports Ryzen 7000, 8000 and 9000 series desktop processors for gaming and AI workloads. Four DDR5 slots accept up to 192GB of memory running at 8000+MT/s with EXPO and AEMP profiles. Dual-channel architecture and ECC support suit both enthusiasts and workstation users.

14+2+2 power stages and heatsinks

A 14+2+2 power solution rated for 80A per stage connects through dual 8-pin ProCool connectors to feed multi-core CPUs. Alloy chokes and durable capacitors reinforce the VRM circuit. Massive heatsinks bridge the VRMs using high-conductivity thermal pads, while an integrated I/O cover adds surface area. One PCIe 5.0 x16 SafeSlot with Q-Release Slim eases GPU swaps, and a second PCIe 4.0 x16 slot shares bandwidth with M.2_3.

Four M.2 slots WiFi 7 and USB 20Gbps

The board provides four M.2 sockets: one PCIe 5.0 x4 for 2242 2260 2280 drives and three PCIe 4.0 x4 slots supporting up to 22110 lengths, all with substantial cooling. Rear I/O includes a USB 20Gbps Type-C port, a USB 10Gbps Type-C port, HDMI and DisplayPort outputs, plus 2.5G LAN. WiFi 7 with Q-Antenna and AI Networking II manage traffic, while ASUS AI Advisor assists configuration in software.

How it compares

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

Price $182.99
Cheaper than about 56% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model nameROG STRIX B850-A GAMING WIFI
Part number90MB1J50-M0AAY0
Processor
ProcessorRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
CPU socketAM5
ChipsetAMD B850
Memory
Memory slot count4 × 288pin (DDR5)
Supported memoryUp to DDR5 8000+MT/s (OC)
Max supported RAM192 GB
Memory channelsDual Channel
Memory profilesAMD EXPO
ECC supportYes
BufferingUn-buffered
Storage
SATA ports2 x SATA 6Gb/s
SATA and RAID support0/1/5/10
Audio & video
Audio chipRealtek ALC4080
Sound channelsROG SupremeFX 7.1 Surround Sound High Definition Audio CODEC ALC4080*
- Impedance sense for front and rear headphone outputs
- Supports: Jack-detection, Multi-streaming, Front Panel MIC Jack-retasking
- High quality 120 dB SNR stereo playback output and 110 dB SNR recording input
- Supports up to 32-Bit/384 kHz playback on front panel
Audio Features
- SupremeFX Shielding Technology
- Savitech SV3H712 AMP
- Rear optical S/PDIF out port
- Premium audio capacitors
- Audio cover
Connectivity
Maximum network speed2.5 Gbit/s
Wi-Fi standardWi-Fi 802.11 be
Bluetooth support5.4
Ports & slots
Onboard USB headers1 x USB 10 Gbit/s connector (supports USB Type-C)
1 x USB 5 Gbit/s header supports 2 additional USB 5 Gbit/s ports
2 x USB 2.0 headers support 4 additional USB 2.0 ports
Power
Power connectors1 × 24-pin Main Power connector
2 × 8-pin +12 V CPU Power connector
Size & build
Form factorATX
Width and length12.0 in × 9.6 in
Shipping weight2.25 kg
Package size353 × 273 × 68 mm
Compatibility
Windows 11 supportSupported
More details
BIOS256 Mb Flash ROM, UEFI AMI BIOS

Other versions of this model

5 more in the same range

Questions about this item

Does the PCIe 5.0 x16 slot run at full speed with a Ryzen 7000 CPU?

With Ryzen 7000 or 9000 series the top slot delivers PCIe 5.0 x16; with Ryzen 8000 series it drops to PCIe 4.0 x8 or x4 depending on the processor.

What clearance do the four M.2 heatsinks need inside a case?

The board fits standard ATX dimensions; the M.2_1 and M.2_2 shields sit under the primary heatsink while M.2_3 and M.2_4 use low-profile covers that clear most dual-slot graphics cards.

Which BIOS step enables EXPO memory profiles on this board?

Enter BIOS, open the AI Tweaker tab, select the EXPO profile that matches your kit, save and exit — skipping the save step leaves the profile inactive.

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