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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

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

Option

  • ASUS ROG STRIX B850-A GAMING WIFI R2 AM5
  • AMD Ryzen 7 9700X Processor + ASUS ROG STRIX B850-A GAMING WIFI R2 AM5
  • AMD Ryzen 7 7700X3D CPU + ASUS ROG STRIX B850-A GAMING WIFI R2 AM5 + G.SKILL Ripjaws M5 Neo RGB Series 16GB DDR5 6000 (PC5 48000)

Struck-through versions exist but are not stocked here.

  • 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.

Highlights

  • 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

Specifications

BrandASUS
ModelROG STRIX B850-A GAMING WIFI R2
CPU Socket TypeAM5
CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Memory StandardSupports up to 8000+MT/s(OC)
Maximum Memory Supported256GB
Channel SupportedDual Channel
Memory Performance ProfileAMD EXPO
ECC SupportedYes
Buffer SupportedUn-buffered
Memory FeatureDual channel memory architecture
Supports AMD Extended Profiles for Overclocking (EXPO)
ASUS Enhanced Memory Profile (AEMP)
** Non-ECC, un-buffered DDR5 memory supports On-Die ECC function.
PCI Express 5.0 x16AMD Ryzen 9000 & 7000 Series Desktop Processors
1 x PCIe 5.0 x16 slot with Q-Release Slim
AMD Ryzen 8000 Series Desktop Processors
1 x PCIe 5.0 x16 slot with Q-Rlease Slim (supports PCIe 4.0 x8/x4 mode)**
PCI Express 4.0 x16AMD 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
Serial ATA (SATA)2 x SATA 6Gb/s
M.2AMD Ryzen 7000 & 9000 Series Desktop Processors
M.2_1 (Key M), type 2242/2260/2280 (supports PCIe 5.0x4 mode)
M.2_2 (Key M), type 2280/22110 (supports PCIe 4.0 x4 mode)
AMD Ryzen 8000 Series Desktop Processors
M.2_1 (Key M), type 2242/2260/2280 (supports PCIe 4.0x4 mode)
M.2_2 (Key M), type 2280/22110 (supports PCIe 4.0 x4/x2 mode)*
AMD B850 Chipset
M.2_3 (Key M), type 2280 (supports PCIe 4.0 x4)**
M.2_4 (Key M), type 2280 (supports PCIe 4.0 x4)
** M.2_3 slot shares bandwidth with PCIEX16(G4). When PCIEX16(G4) slot is operating, M.2_3 will be disabled.
SATA RAIDAMD 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 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.
Max LAN Speed2.5Gbps
Wireless LANWi-Fi 802.11 be
BluetoothBluetooth 5.4
Back I/O Ports1 x USB 20Gbps port (1 x USB Type-C)
3 x USB 10Gbps ports (2 x Type-A + 1 x USB Type-C)
4 x USB 5Gbps ports (4 x Type-A)
2 x USB 2.0 ports (2 x Type-A)
1 x HDMI port
1 x Wi-Fi module
1 x Intel 2.5Gb Ethernet port
2 x Audio jacks
1 x Optical S/PDIF out port
1 x BIOS FlashBack button
1 x Clear CMOS button
Onboard USB1 x USB 10Gbps connector (supports USB Type-C)
1 x USB 5Gbps header supports 2 additional USB 5Gbps ports
2 x USB 2.0 headers support 4 additional USB 2.0 ports
Other ConnectorsFan and Cooling Related
1 x 4-pin CPU Fan header
1 x 4-pin CPU OPT Fan header
1 x 4-pin AIO Pump header
4 x 4-pin Chassis Fan headers
Miscellaneous
3 x Addressable Gen 2 headers
1 x CPU Over voltage jumper
1 x Front Panel Audio header (F_AUDIO)
1 x Power button
1 x 10-1 pin Front System Panel header
1 x Thermal Sensor header
1 x Thunderbolt (USB4) header
Form FactorATX
Dimensions (W x L)12.0" x 9.6"
Power Pin1 x 24-pin Main Power connector
2 x 8-pin +12V CPU Power connector
BIOS Feature256 Mb Flash ROM, UEFI AMI BIOS
SoftwareROG Exclusive Software
- ROG CPU-Z
- Dolby Atmos
ASUS Exclusive Software
Armoury Crate
- AIDA64 Extreme (60 days free trial)
- Aura Creator
- Aura Sync
- GameFirst
- HWiNFO
- Fan Xpert 4
ASUS DriverHub
ASUS GlideX
TurboV Core
Adobe Creative Cloud (Free Trial)
Norton 360 for Gamers (60 Days Free Trial)
WinRAR (40 Days Free Trial)
UEFI BIOS
ASUS EZ DIY
- ASUS CrashFree BIOS 3
- ASUS EZ Flash 3
- ASUS UEFI BIOS EZ Mode
- ASUS MyHotkey
FeaturesExtreme Engine Digi+
- 5K Black metallic capacitors
ASUS Q-Design
- M.2 Q-Latch
- M.2 Q-Release
- PCIe Slot Q-Release Slim (with PCIe SafeSlot)
- Q-Antenna
- Q-Dashboard
- Q-DIMM
- Q-LED (CPU [red], DRAM [yellow], VGA [white], Boot Device [yellow green])
- Q-Slot
ASUS Thermal Solution
- M.2 heatsink
ASUS EZ DIY
- BIOS FlashBack button
- BIOS FlashBack LED
- Clear CMOS button
- ProCool
- Pre-mounted I/O shield
- SafeSlot
- SafeDIMM
Aura Sync
- Addressable Gen 2 headers
Package ContentsCables
2 x SATA 6Gb/s cables
Miscellaneous
1 x ASUS WiFi Q-Antenna
1 x Cable ties package
1 x M.2 Q-Latch package
1 x ROG key chain
1 x ROG Strix stickers
4 x M.2 rubbers
Documentation
1 x Quick start guide
Shipping weight2.25 kg
Package size368 × 279 × 76 mm

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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