ASUS PRIME B850-PLUS WIFI AMD B850 ATX Motherboard DDR5
ASUS
ASUS PRIME B850-PLUS WIFI AMD B850 ATX Motherboard DDR5
The ASUS PRIME B850-PLUS WIFI AMD B850 ATX Motherboard DDR5 is built for PC builders who want a stable, well-connected foundation for AMD Ryzen 9000, 8000, and 7000 series desktop processors. It combines a robust digital power design, three M.2 storage slots including one PCIe 5.0 slot, Wi-Fi 6E, and 2.5Gb Ethernet to handle both everyday workloads and demanding AI applications. BIOS FlashBack and AEMP/EXPO memory tuning make it approachable for builders who want headroom to configure without complexity.
Why this product
AM5 Socket with broad Ryzen support
Compatible with AMD Ryzen 9000, 8000, and 7000 series desktop processors in the AM5 socket, supporting CPUs up to 170W.
8+2+1 phase digital power design
Discrete MOSFETs across an 8+2+1 phase layout deliver efficient, stable power to the processor for consistent day-to-day performance.
Three M.2 slots, one at PCIe 5.0 speeds
The primary M.2 slot supports PCIe 5.0 x4 for data-transfer speeds up to 128 Gbps, while the other two slots run on PCIe 4.0.
Wi-Fi 6E and 2.5Gb Ethernet onboard
Built-in Wi-Fi 6E (802.11ax) covers 2.4, 5, and 6 GHz bands with Bluetooth 5.3, alongside a Realtek 2.5Gb wired Ethernet port with ASUS LANGuard.
DDR5 tuning up to 8000+ MT/s
Supports ASUS Enhanced Memory Profile (AEMP) and AMD EXPO for broad DDR5 compatibility from entry-level to high-speed kits, with a maximum of 256GB across four slots.
BIOS FlashBack for easy firmware updates
The BIOS FlashBack button lets you update firmware without a CPU or memory installed, simplifying first-build setup and recovery.
- SocketAMD AM5
- ChipsetAMD B850
- Form FactorATX (12 × 9.6 inch)
- MemoryDDR5, up to 256GB, up to 8000+ MT/s (OC)
- Primary M.2 SpeedPCIe 5.0 x4 (up to 128 Gbps)
- Wired Networking2.5Gb Ethernet
- WirelessWi-Fi 6E (802.11ax), Bluetooth 5.3
- Rear USB8 ports including USB 10Gbps Type-C
- SKUASU-2678
- EAN4711387931509
- AMD Ryzen 9000 series desktop processors (AM5 socket)
- AMD Ryzen 8000 series desktop processors (AM5 socket)
- AMD Ryzen 7000 series desktop processors (AM5 socket)
- DDR5 Un-buffered DIMMs (ECC and Non-ECC), up to 256GB across four slots
- The primary PCIe x16 slot runs at x16 mode with Ryzen 9000 and 7000 processors, but drops to x8/x4 mode with Ryzen 8000 series
- ATX form factor (12 × 9.6 inch); verify your case supports full ATX before purchasing
Best for
- First-time builders who want BIOS FlashBack for firmware updates without a fully assembled system
- Content creators and AI workload users who need fast local storage via the PCIe 5.0 M.2 slot and a 2.5Gb wired network connection
- Wireless-first setups where Wi-Fi 6E across three frequency bands and Bluetooth 5.3 removes the need for a separate adapter
- RGB enthusiasts who want Aura Sync control with three onboard Addressable RGB Gen 2 headers
- Builders planning future storage expansion who benefit from three M.2 slots and four SATA 6Gb/s ports simultaneously available
Trade-offs
- AMD Threadripper or HEDT builds — this board supports only AM5 consumer desktop processors
- DDR4 memory users — the board accepts DDR5 only; existing DDR4 kits are incompatible
- Builders needing 10Gb or faster wired networking — the onboard Ethernet tops out at 2.5Gb
- Full PCIe 5.0 x16 graphics bandwidth with Ryzen 8000 processors — the primary slot operates at x8/x4 mode with that CPU family
- Systems requiring more than four SATA ports — the board provides exactly four SATA 6Gb/s connections with no additional SATA expansion headers listed
ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen™ 9000 series processors. The PRIME B850-PLUS WIFI motherboard provides users and PC DIY builders with a range of performance optimizations via intuitive software and firmware features. It's designed to be Advanced AI PC-ready, offering the power and connectivity needed for demanding AI applications.
Digital Power Design
PRIME B850-PLUS WIFI features an 8+2+1 phase power design with discrete MOSFETs, ensuring efficient and stable power delivery for AMD processors plus steady performance for day-to-day use.
Enhanced DDR5 performance
Comprehensive memory tuning options are the cornerstone of PRIME motherboards. The PRIME B850-PLUS WIFI maximizes the potential of your DDR5 modules, from entry-level to extreme-speed kits.
Three M.2 slots (up to 128 Gbps)
PRIME B850-PLUS WIFI offers a total of three M.2 slots, including one that supports data-transfer speeds of up to 128 Gbps via PCIe 5.0, and two that support PCIe 4.0.
Cooler by design
The PRIME B850-PLUS WIFI motherboard is engineered with multiple onboard heatsinks and an array of hybrid fan headers to help ensure your rig stays cool.
General
| Brand | ASUS |
|---|---|
| Model | PRIME B850-PLUS WIFI |
| Form Factor | ATX, 12 inch × 9.6 inch (30.5 cm × 24.4 cm) |
| Chipset | AMD B850 |
| CPU Socket | AMD AM5 |
| Supported Processors | AMD Ryzen 9000, 8000 & 7000 Series Desktop (up to 170W) |
| Operating System | Windows 11, Windows 10 64-bit |
| BIOS | 256 Mb Flash ROM, UEFI AMI BIOS |
Networking
| Standard | Wi-Fi 6E (802.11ax) |
|---|---|
| Frequency Bands | 2.4 GHz / 5 GHz / 6 GHz |
| Wi-Fi Configuration | 2×2 |
| Bluetooth | Bluetooth 5.3 |
| Wired Ethernet | Realtek 2.5Gb Ethernet with ASUS LANGuard |
| Throughput (Wired) | 2.5 Gbps |
Performance & Storage
| Memory Type | DDR5 Un-buffered DIMM (ECC and Non-ECC) |
|---|---|
| Memory Slots | 4 x DIMM |
| Max Memory | 256GB |
| Memory Speed (OC) | Up to 8000+ MT/s |
| Memory Profiles | ASUS AEMP, AMD EXPO |
| Power Design | 8+2+1 phase with discrete MOSFETs |
| M.2 Slots | 3 x M.2 (Key M, type 2280) |
| M.2_1 | PCIe 5.0 x4, up to 128 Gbps, type 2280 |
| M.2_2 | PCIe 4.0 x4, type 2280 |
| M.2_3 | PCIe 4.0 x2, type 2242/2260/2280/22110 |
| SATA Ports | 4 x SATA 6Gb/s |
| PCIe (Ryzen 9000 & 7000) | 1 x PCIe 5.0 x16 (x16 mode) |
| PCIe (Ryzen 8000) | 1 x PCIe 4.0 x16 (x8/x4 mode) |
| PCIe Chipset | 1 x PCIe 4.0 x16 (x4 mode), 2 x PCIe 3.0 x16 (x1 mode) |
Ports & Connectivity
| Rear USB | 4 x USB 10Gbps (3 x Type-A + 1 x Type-C), 2 x USB 5Gbps Type-A, 2 x USB 2.0 Type-A |
|---|---|
| Front USB Headers | 1 x USB 5Gbps Type-C connector, 1 x USB 5Gbps header (2 ports), 3 x USB 2.0 headers (6 ports) |
| Video Output | 1 x DisplayPort 1.4 (up to 8K@30Hz), 1 x HDMI 2.1 (up to 4K@60Hz) |
| Audio | Realtek 7.1 Surround Sound HD Audio, up to 24-bit/192kHz |
| Audio Features | Audio Shielding, premium capacitors, dedicated audio PCB layers |
| RGB Headers | 3 x Addressable RGB Gen 2 |
| Internal Headers | Thunderbolt (USB4) header, SPI TPM header (14-1 pin), COM Port header, S/PDIF Out, Chassis Intrusion, Clear CMOS |
| Manageability | Wake-on-LAN (WOL by PME), PXE |
| Accessories | 2 x SATA 6Gb/s cables, 1 x WiFi Q-Antenna, M.2 rubber packages, screw packages, quick start guide |
Shipping
All our products are shipped from the United Kingdom within 24 to 48 hours of purchase. See our Shipping and Returns page for full details.
Returns
- Tech Syndicate offers a full money-back guarantee on all purchases made in our store. If you are not satisfied with your purchase, we will provide a full refund, no questions asked.
- Refunds are available within 45 days of delivery.
- After the 45-day period you are no longer eligible for a refund, so we encourage you to try the product within the first few weeks to make sure it fits your needs.