Overview
The ASUS ROG Strix B850-A Gaming WiFi is an ATX motherboard designed for desktop PCs built around compatible AMD Ryzen 9000, 8000, and 7000 Series processors. It combines the AMD B850 chipset, DDR5 memory support, PCIe expansion, NVMe storage connectivity, integrated Wi-Fi 7, and 2.5 Gigabit Ethernet in a white-themed ROG Strix design.
The motherboard provides four memory slots, four M.2 sockets, two SATA storage ports, and multiple USB connections. Its white and silver styling makes it suitable for PC builds that use coordinated components, while ASUS Q-Design features simplify selected installation and maintenance tasks.
Processor and Memory Support
The AM5 socket supports compatible AMD Ryzen 9000, 8000, and 7000 Series desktop processors. Check the ASUS CPU support list and the motherboard BIOS requirements before selecting a processor.
Four DDR5 DIMM slots support dual-channel memory configurations and up to 256GB of memory according to ASUS's current specifications. Supported memory speeds reach 8000+ MT/s through overclocking, depending on the processor, memory kit, module configuration, and BIOS settings.
AMD EXPO and ASUS Enhanced Memory Profile (AEMP) provide memory-profile options for compatible modules. The board supports ECC and non-ECC unbuffered memory, subject to processor and memory compatibility.
Expansion and Storage
The motherboard provides one primary PCIe 5.0 x16 expansion slot for a compatible graphics card and one chipset-connected PCIe 4.0 x16 slot operating at up to x4 mode. With Ryzen 8000 Series processors, the primary graphics slot operates at PCIe 4.0 x8 or x4, depending on the processor.
Four M.2 sockets support NVMe storage. With compatible Ryzen 9000 and 7000 Series processors, the primary M.2 socket supports PCIe 5.0 x4, while the second processor-connected socket supports PCIe 4.0 x4. Ryzen 8000 Series processors have different supported M.2 interface modes. The two chipset-connected M.2 sockets support PCIe 4.0 x4.
Two SATA 6Gb/s ports provide connectivity for compatible SATA storage devices. The M.2_3 socket shares bandwidth with the PCIEX16(G4) expansion slot; using that expansion slot disables M.2_3. Consider this limitation when planning multiple drives and expansion cards.
Networking and Wireless Connectivity
Integrated Wi-Fi 7 supports 2.4GHz, 5GHz, and 6GHz bands, with 2x2 connectivity and 160MHz channel bandwidth. ASUS specifies wireless transfer rates of up to 2.9Gbps under supported conditions. Actual performance depends on the router, operating system, regional regulations, interference, and network configuration.
Bluetooth 5.4 supports compatible wireless peripherals, while Intel 2.5Gb Ethernet provides a wired networking option for compatible networks. ASUS LANGuard is also included.
ASUS specifies Windows 11 version 24H2 or later for full Wi-Fi 7 functionality. Earlier Windows 11 releases listed by ASUS support Wi-Fi 6E functionality instead. ASUS also notes that a Windows 10 driver is not provided for the wireless functionality.
USB Connectivity and Audio
The rear I/O panel provides ten USB ports, including one USB 20Gbps Type-C port, three USB 10Gbps ports, four USB 5Gbps ports, and two USB 2.0 ports. Internal headers support additional front-panel USB connectivity, including a USB Type-C connection.
ROG SupremeFX audio uses the Realtek ALC4080 codec and Savitech SV3H712 amplifier. Supported audio features include 7.1-channel surround sound, front-panel headphone amplification, and a rear optical S/PDIF output. Full analog 7.1-channel output requires a compatible chassis front-panel HD audio connection.
Key Features
- AMD AM5 platform: Supports compatible Ryzen 9000, 8000, and 7000 Series desktop processors.
- DDR5 memory support: Four DIMM slots accommodate up to 256GB of memory with supported configurations.
- PCIe 5.0 and four M.2 sockets: Provides high-speed expansion and NVMe storage options, with processor-dependent interface capabilities.
- Integrated Wi-Fi 7: Combines wireless networking, Bluetooth 5.4, and Intel 2.5Gb Ethernet.
- ROG Q-Design and BIOS FlashBack: Includes selected tool-free installation features, diagnostic indicators, and a dedicated BIOS recovery button.
Applications
- Gaming desktop PCs: Provides a platform for compatible AMD Ryzen processors, discrete graphics cards, DDR5 memory, and NVMe storage.
- White-themed PC builds: Its white and silver design complements compatible white chassis, graphics cards, memory modules, and cooling components.
- Content creation systems: Supports compatible processor and memory configurations for video editing, design software, and GPU-accelerated applications.
- Multi-drive desktop systems: Supports multiple M.2 storage devices and SATA drives, subject to the documented lane-sharing limitations.
Installation and Compatibility
The ASUS ROG Strix B850-A Gaming WiFi uses the standard ATX form factor and measures 30.5 × 24.4 cm. Confirm that the selected case supports ATX motherboards and provides the required clearance for the processor cooler, graphics card, memory, and storage devices.
Processor compatibility should be checked against ASUS's official CPU support list. The installed processor determines certain PCIe and M.2 operating modes, so selecting the CPU before planning the storage and expansion layout is recommended.
The motherboard includes rear HDMI 2.1 and DisplayPort 1.4 outputs. These outputs depend on the installed processor providing supported integrated graphics; they do not replace the display connections available on a discrete graphics card.
DC Supplies Product Note
For a build using several NVMe drives and expansion cards, plan the slot arrangement before assembly. The M.2_3 socket and PCIEX16(G4) slot share bandwidth, so operating the latter disables M.2_3. Also verify the processor-specific PCIe modes and memory compatibility before purchasing the remaining components.
Specifications
| Specification | Details |
|---|
| Brand | ASUS |
| Manufacturer | ASUSTeK Computer Inc. |
| Part Number / MPN | ROG STRIX B850-A GAMING WIFI |
| Product Type | Desktop motherboard |
| Product Series | Republic of Gamers (ROG) Strix |
| Chipset | AMD B850 |
| CPU Socket | AMD Socket AM5 |
| Supported Processor Families | AMD Ryzen 9000, 8000, and 7000 Series desktop processors |
| Memory Type | DDR5 |
| Memory Slots | 4 × DIMM |
| Maximum Memory Capacity | 256GB |
| Memory Architecture | Dual-channel |
| Maximum Specified Memory Speed | Up to 8000+ MT/s (OC), depending on processor and configuration |
| Memory Profile Support | AMD EXPO and ASUS AEMP |
| Primary Expansion Slot | 1 × PCIe 5.0 x16; Ryzen 8000 Series processors operate at PCIe 4.0 x8 or x4, depending on CPU |
| Additional Expansion Slot | 1 × PCIe 4.0 x16, operating at up to x4 mode |
| M.2 Storage | 4 × M.2 sockets |
| Primary M.2 Interface | PCIe 5.0 x4 with compatible Ryzen 9000 and 7000 Series processors; PCIe 4.0 x4 with Ryzen 8000 Series processors |
| Second Processor-Connected M.2 | PCIe 4.0 x4 with Ryzen 9000 and 7000 Series processors; processor-dependent mode with Ryzen 8000 Series |
| Chipset-Connected M.2 | 2 × PCIe 4.0 x4 |
| SATA Storage | 2 × SATA 6Gb/s |
| Wired Networking | Intel 2.5Gb Ethernet |
| Wireless Networking | Wi-Fi 7 (802.11be), 2×2, 2.4GHz / 5GHz / 6GHz |
| Bluetooth | Bluetooth 5.4 |
| Rear USB Ports | 10 total: 1 × USB 20Gbps Type-C, 3 × USB 10Gbps, 4 × USB 5Gbps, 2 × USB 2.0 |
| Front USB Expansion | USB 10Gbps Type-C header, USB 5Gbps header for 2 ports, 2 USB 2.0 headers for 4 ports |
| Audio Codec | ROG SupremeFX, Realtek ALC4080 |
| Audio Amplifier | Savitech SV3H712 |
| Digital Audio Output | Optical S/PDIF |
| Display Outputs | 1 × DisplayPort 1.4 and 1 × HDMI 2.1, subject to CPU graphics support |
| CPU Power Connectors | 2 × 8-pin +12V |
| Main Power Connector | 1 × 24-pin |
| BIOS Recovery | BIOS FlashBack |
| Diagnostic Features | Q-LED and Clear CMOS button |
| Form Factor | ATX |
| Dimensions | 30.5 × 24.4 cm (12 × 9.6 inches) |
| Operating System Listed by ASUS | Windows 11 |
Frequently Asked Questions
Which processors are compatible with this motherboard?
The motherboard supports compatible AMD Ryzen 9000, 8000, and 7000 Series desktop processors using the AM5 socket. Check the ASUS CPU support list and BIOS requirements for the exact processor model.
Does the ASUS ROG Strix B850-A Gaming WiFi support PCIe 5.0 SSDs?
Yes. The primary M.2 socket supports PCIe 5.0 x4 with compatible Ryzen 9000 and 7000 Series processors. With Ryzen 8000 Series processors, the primary M.2 socket operates at PCIe 4.0 x4.
Can all four M.2 sockets be used with an expansion card installed?
The motherboard has four M.2 sockets, but the M.2_3 socket shares bandwidth with the PCIEX16(G4) slot. When that expansion slot is operating, M.2_3 is disabled. Review the motherboard manual when planning the final configuration.
Does this motherboard include Wi-Fi and Bluetooth?
Yes. Wi-Fi 7 and Bluetooth 5.4 are integrated. Full Wi-Fi 7 functionality requires a supported operating system, and wireless capabilities also depend on regional regulations and compatible network equipment.
Can the HDMI and DisplayPort outputs be used without a graphics card?
These motherboard display outputs can be used when the installed processor provides compatible integrated graphics. Check the specifications of the selected Ryzen processor before relying on the motherboard's display connections.
What is the maximum supported memory capacity?
ASUS currently lists support for up to 256GB of DDR5 memory across four DIMM slots. Supported capacity and memory speeds depend on the processor, memory modules, and system configuration.
Product Identification
Brand: ASUS
Manufacturer: ASUSTeK Computer Inc.
Series: ROG Strix
Model: B850-A Gaming WiFi
Part Number / MPN: ROG STRIX B850-A GAMING WIFI
Product Type: AMD AM5 ATX motherboard
