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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

  • CPU Socket TypeAM5
  • CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
  • ChipsetAMD B850
  • Number of Memory Slots4x288pin (DDR5)
  • Memory StandardUp to DDR5 8000+MT/s (OC)
  • Maximum Memory Supported192GB

Option ROG STRIX B850-A GAMING WIFI

Les versions barrées existent, mais ne sont pas disponibles ici.

  • 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.

Points forts

  • 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

Caractéristiques

BrandASUS
ModelROG STRIX B850-A GAMING WIFI
Part Number90MB1J50-M0AAY0
CPU Socket TypeAM5
CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Memory StandardUp to DDR5 8000+MT/s (OC)
Maximum Memory Supported192GB
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)
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 or x4 mode)*
PCI Express 4.0 x161 x PCIe 4.0 x16 slot (supports x4 mode)**
* Specifications vary by CPU types.
** 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 RAID0/1/5/10
Audio ChipsetRealtek ALC4080
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
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 DisplayPort
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
- Power Saving
- 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
Windows 11Supported
FeaturesExtreme Engine Digi+
- 5K Black metallic capacitors
ASUS Q-Design
- M.2 Q-Latch
- M.2 Q-Release
- M.2 Q-Slide
- 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 backplate
- 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 M.2 Q-Slide package
1 x ROG key chain
1 x ROG Strix stickers
4 x M.2 rubbers
Documentation
1 x Quick start guide
Poids d’expédition2.25 kg
Dimensions du colis353 × 273 × 68 mm

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Questions sur cet article

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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