ASUS
ASUS B850M MAX GAMING WIFI
B850 · AMD AM5 · Micro-ATX · DDR5 up to 256 GB
MPN90MB1LL0-M0EAY0
CategoryMotherboards
Technical Specifications
Full Product Details
Processor & Chipset
| CPU Socket | AMD AM5 (LGA 1718) |
| Chipset | AMD B850 |
| Supported CPUs | AMD Ryzen 9000 Series / Ryzen 8000 Series / Ryzen 7000 Series Desktop Processors |
| VRM Power Phases | 8+2+1 (discrete MOSFETs) |
Memory
| Memory Type | DDR5 |
| DIMM Slots | 4 x DDR5 DIMM (Dual Channel) |
| Max Capacity | 256 GB |
| Max Speed (OC) | 8000+ MT/s |
| Native Speed | 4800 MT/s |
| ECC Support | Non-ECC, un-buffered |
| XMP / EXPO | AMD EXPO & Intel XMP supported |
Storage
| M.2_1 (from CPU) | PCIe 5.0 x4 — Type 2280 (Ryzen 9000 & 7000) |
| M.2_2 (from chipset) | PCIe 4.0 x4 — Type 2242 / 2260 / 2280 |
| M.2_3 (from chipset) | PCIe 4.0 x2 — Type 2242 / 2260 / 2280 |
| SATA Ports | 4 x SATA 6 Gb/s |
| RAID Support | RAID 0, 1, 10 (SATA); RAID 0, 1 (NVMe via chipset) |
Expansion Slots
| PCIe x16 (GPU) | 1 x PCIe 5.0 x16 (Ryzen 9000 / 7000) — PCIe 4.0 x8/x4 (Ryzen 8000) |
| PCIe x1 Slots | 3 x PCIe 4.0 x16 slots (running at x1 mode) |
USB & Rear I/O Panel
| USB 10 Gbps (Rear) | 1 x Type-A + 1 x USB Type-C |
| USB 5 Gbps (Rear) | 2 x Type-A |
| USB 2.0 (Rear) | 5 x Type-A |
| USB (Front Headers) | 1 x USB 5Gbps Type-C header; 2 x USB 5Gbps headers (up to 4 ports); 2 x USB 2.0 headers (up to 4 ports) |
| Display Outputs | 1 x HDMI 2.1 + 1 x DisplayPort 1.4 |
| BIOS FlashBack Button | Yes (rear I/O) |
| PS/2 Combo Port | 1 x PS/2 keyboard / mouse |
Networking & Connectivity
| Ethernet | Realtek 1 Gb Ethernet |
| Wi-Fi | Wi-Fi 6 (802.11ax) — 2x2 MIMO |
| Bluetooth | Bluetooth 5.4 |
Audio
| Audio Codec | Realtek 7.1 Surround Sound HD Audio CODEC |
| Max Playback | 24-Bit / 192 kHz |
| Features | Audio shielding, premium capacitors, dedicated audio PCB layers, jack-detection, multi-streaming |
Physical & Form Factor
| Form Factor | Micro-ATX |
| Dimensions (L x W) | 244 x 244 mm (9.6" x 9.6") |
| Supported OS | Windows 11 64-bit, Windows 10 64-bit |
Special Features
| BIOS FlashBack | USB BIOS FlashBack — update BIOS without CPU or memory installed |
| RGB Lighting | ASUS Aura Sync — addressable Gen 2 RGB header + AURA RGB header |
| Fan Headers | 1 x CPU Fan, 1 x CPU OPT Fan, 2 x Chassis Fan, 1 x AIO Pump |
| Power Connectors | 1 x 24-pin EATX power + 1 x 8-pin ATX 12V |
Support & Downloads
BIOS Update (Latest)
ASUS Support →
BIOS Recovery Tool
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Chipset Driver Package
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LAN / Wi-Fi / Bluetooth Drivers
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Audio Drivers
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ASUS Motherboard User Manual
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Quick Start Guide
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Developer Preview
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