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ATX motherboard with white and silver heatsinks, four DDR5 slots, multiple M.2 covers, PCIe 5.0 x16 slot, rear I/O shield

ASUS

ASUS ROG STRIX B850-A GAMING WIFI R2 AMD motherboard

SKU CH-J6QA-1EPB7 MPN ROG STRIX B850-A GAMING WIFI R2

ATX board for Ryzen 7000, 8000 and 9000 CPUs with 14+2+1 power stages, DDR5 up to 8000 MT/s, PCIe 5.0 x16, four M.2 slots, WiFi 7 and 2.5 Gb Ethernet

  • ProcessorRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
  • ChipsetAMD B850
  • Form factorATX
  • CPU socketAM5
  • Memory slot count4 × 288pin (DDR5)
  • Supported memorySupports up to 8000+MT/s(OC)
  • Ready for Ryzen 9000, 8000 and 7000 series CPUs via AM5 socket
  • 14+2+1 power stages deliver stable voltage for high-core-count processors
  • DDR5 memory support up to 8000+ MT/s with EXPO and AEMP profiles
  • PCIe 5.0 x16 slot plus two M.2 slots for fastest GPUs and storage
  • WiFi 7 and 2.5Gb Ethernet plus rear USB 20Gbps Type-C for modern connectivity

Socket AM5 DDR5 platform

This ATX motherboard uses the AMD B850 chipset to support Ryzen 7000, 8000 and 9000 series processors in the AM5 socket. Four DDR5 slots accept up to 256GB of memory running at 8000+ MT/s when overclocked. The board targets builders who want a current-generation AMD foundation with high-speed memory headroom.

Gamers and creators needing PCIe 5.0 graphics

The primary PCIe 5.0 x16 slot with Q-Release Slim suits modern graphics cards, while Wi-Fi 7 and 2.5Gb Ethernet cover low-latency networking. Users relying on Ryzen 8000 series CPUs lose PCIe 5.0 x16 bandwidth and some RAID modes, so they should verify compatibility. Builds requiring more than two SATA ports or legacy PCIe 3.0 expansion should look elsewhere.

14+2+1 power stage VRM

The voltage regulator module uses 14+2+1 power stages to feed the CPU socket. This count determines how cleanly the board delivers current to high-core-count Ryzen 9000 parts under sustained load. If your planned processor draws more power than this VRM is rated for, choose a board with a higher phase count.

How it compares

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

Price $186.99
Cheaper than about 56% 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 nameASUS
Model nameROG STRIX B850-A GAMING WIFI R2
Processor
ProcessorRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
CPU socketAM5
ChipsetAMD B850
Memory
Memory slot count4 × 288pin (DDR5)
Supported memorySupports up to 8000+MT/s(OC)
Max supported RAM256 GB
Memory channelsDual Channel
Memory profilesAMD EXPO
ECC supportYes
BufferingUn-buffered
Storage
SATA ports2 x SATA 6Gb/s
SATA and RAID supportAMD RAIDXpert2 Technology
Ryzen 9000 Series Processors: RAID 0/1/5/10
Ryzen 8000 Series Processors: RAID 0/1
Ryzen 7000 Series Processors: RAID 0/1/10
Audio & video
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
* A chassis with an HD audio module in the front panel is required to support 7.1 Surround Sound audio output.
Connectivity
Maximum network speed2.5 Gbit/s
Wi-Fi standardWi-Fi 802.11 be
Bluetooth support5.4
Ports & slots
PCIe 4.0 x16 slotsAMD B850 Chipset
1 x PCIe 4.0 x16 slot (supports x4 mode)*
* PCIEX16(G4) slot (supports x4 mode) from AMD B850 Chipset shares bandwidth with M.2_3
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 size368 × 279 × 76 mm
More details
BIOS256 Mb Flash ROM, UEFI AMI BIOS

Questions about this item

How can I confirm the 14+2+1 power stages are delivering clean voltage to my Ryzen 9000 CPU after build?

Enter the UEFI and open the hardware monitor; the Vcore, VDDCR_SOC and VDDCR_VDD readings should remain stable under load, and the VRM heatsink temperature reported by Fan Xpert 2+ should stay within normal operating range.

What cooling and RGB parts are included in the box versus what I must source separately for the ROG STRIX B850-A GAMING WIFI R2?

The box contains the motherboard, I/O shield, Wi-Fi 7 antenna, SATA cables, M.2 screws, Q-Release Slim tool and documentation; CPU cooler, DDR5 modules, M.2 SSDs, case fans and addressable Gen 2 RGB strips are purchased separately.

Which M.2 slot should I populate first for a PCIe 5.0 x4 drive on a Ryzen 9000 processor?

Use M.2_1 (Key M, 2242/2260/2280) — it runs at PCIe 5.0 x4 directly from the CPU; M.2_2 operates at PCIe 4.0 x4 and shares bandwidth with the chipset x16 slot.

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