ASUS PRIME B840M-A WIFI AM5 microATX Motherboard DDR5
ASUS
ASUS PRIME B840M-A WIFI AM5 microATX Motherboard DDR5
The ASUS PRIME B840M-A WIFI is a micro-ATX motherboard for AMD Ryzen 9000, 8000 and 7000 series processors, built for PC builders and enthusiasts who want solid core performance with integrated WiFi 6E and modern connectivity. It combines DDR5 memory support, PCIe 4.0 storage, and AI PC-ready features in a compact form factor.
Why this product
WiFi 6E with 6 GHz band support
Built-in WiFi 6E connects across 2.4, 5, and 6 GHz bands with triple the bandwidth of standard WiFi, delivering lower latency and better performance in congested wireless environments.
2.5 Gb Ethernet for faster wired data
Realtek 2.5 Gb connection reduces CPU overhead and handles high TCP/UDP throughput, suitable for fast local file transfers and demanding network tasks.
DDR5 with EXPO and AEMP support
Supports up to 7600+ MT/s (overclocked) with automatic memory profiling via AEMP for entry-level modules, plus full AMD Extended Profiles for Overclocking for manual tuning.
Three M.2 slots and four SATA ports
Two PCIe 4.0 M.2 slots for fast NVMe drives plus a third PCIe 3.0 slot, combined with four SATA 6Gb/s ports for flexible storage expansion.
8+2+1 phase digital power design
Robust power delivery with hybrid fan headers and extensive heatsinking keeps the board stable during overclocking and sustained workloads.
- SocketAMD AM5
- Form factormicro-ATX (9.6" × 9.6")
- MemoryDDR5, up to 256 GB, up to 7600+ MT/s (OC)
- Storage slots3 × M.2 (2 × PCIe 4.0, 1 × PCIe 3.0), 4 × SATA
- WirelessWiFi 6E, Bluetooth 5.3
- Rear USB2 × USB 10Gbps Type-A, 1 × USB 5Gbps Type-C, 4 × USB 2.0
- Network2.5 Gb Ethernet
- SKUASU-2719
- EAN4711387797143
- Works with AMD Ryzen 9000, 8000 and 7000 series processors in AM5 socket (up to 170W TDP support).
- Supports DDR5 memory up to 256 GB across four DIMM slots, including ECC and non-ECC modules with On-Die ECC.
- Dual DisplayPort (8K@30Hz max) and HDMI (4K@60Hz max) outputs for multi-display setups.
- PCIe 4.0 x16 GPU slot operates at x8 or x4 mode on Ryzen 8000 series; full x16 mode on Ryzen 9000 and 7000 series.
- WiFi 6E 6 GHz band support requires Windows 11 or later and may vary by country due to regulatory differences.
Best for
- Mid-range PC builders seeking DDR5 and PCIe 4.0 in a compact micro-ATX form factor.
- Users prioritizing wireless connectivity, with WiFi 6E and Bluetooth 5.3 built-in.
- Enthusiasts planning moderate overclocking via EXPO profiles and extensive UEFI settings.
- Content creators and gamers needing fast local file transfers via 2.5 Gb Ethernet or USB 10Gbps ports.
Trade-offs
- Large form factor builds; this is micro-ATX (9.6" × 9.6"), not full or extended ATX.
- Systems requiring more than four SATA ports or more than two PCIe 4.0 M.2 slots on higher-tier processors.
- Setups needing PoE (Power over Ethernet) — this board does not support it.
- Users on older operating systems; WiFi 6E 6 GHz requires Windows 11 or later.
ASUS Prime series motherboards are expertly engineered to unleash the full potential of AMD Ryzen™ 9000 series processors. The PRIME B840M-A 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.
For entry-level modules without EXPO™ support, ASUS Enhanced Memory Profile (AEMP) automatically detects memory chips and provides optimized profiles for enhanced performance. For those looking to surpass stock DDR5 speeds, the PRIME B840M-A WIFI offers extensive AMD Extended Profiles for Overclocking (EXPO™) support and a wide array of UEFI settings for further performance tweaks.
This enables quicker boot-up and app load times with OS or application drives. The PRIME B840M-A WIFI motherboard is engineered with multiple onboard heatsinks and an array of hybrid fan headers to help ensure your rig stays cool and stable under intense workloads. Massive VRM heatsink and essential thermal pads improve heat transfer from the MOSFETs and chokes for better cooling performance.
This motherboard offers a versatile range of connectivity, including support for WiFi 6E, PCIe 4.0 slot and an arsenal of USB ports which includes Type-C® connections. Built-in WiFi 6E technology takes advantage of the newly available radio spectrum in the 6 GHz band. With triple the bandwidth of the 2.4/5/6 GHz band, WiFi 6E delivers ultrafast wireless networking speeds with improved capacity and better performance in dense wireless environments.
Realtek 2.5 Gb Ethernet reduces CPU overhead and offers exceptionally high TCP and UDP throughput for faster, smoother data transfers. This motherboard features a USB 5Gbps Type-C® front panel connector for speedy data transfers of up to 5Gbps.
General
| Brand | ASUS |
|---|---|
| Chipset | AMD B840 |
| CPU compatibility | Ryzen 9000, 8000, 7000 series (AM5 socket), up to 170W TDP |
Networking
| Ethernet | 1 × Realtek 2.5 Gb with LANGuard |
|---|---|
| WiFi standard | WiFi 6E (802.11ax) |
| WiFi frequency bands | 2.4 GHz, 5 GHz, 6 GHz |
| Bluetooth | 5.3 |
Performance
| Memory type | DDR5 |
|---|---|
| Memory slots | 4 × DIMM |
| Max memory | 256 GB |
| Max memory speed (OC) | 7600+ MT/s |
| Memory features | EXPO, AEMP, ECC support, On-Die ECC |
| Power phases | 8+2+1 digital |
Ports & power
| PCIe GPU slot | 1 × PCIe 4.0 x16 (x16 on Ryzen 9000/7000; x8/x4 on Ryzen 8000) |
|---|---|
| PCIe expansion slots | 2 × PCIe 3.0 x16 (x1 mode) |
| M.2 slots | 3 (2 × PCIe 4.0, 1 × PCIe 3.0) |
| SATA ports | 4 × 6 Gb/s |
| Display outputs | 2 × DisplayPort (8K@30Hz), 1 × HDMI (4K@60Hz) |
| Rear USB 10Gbps | 2 × Type-A |
| Rear USB 5Gbps | 1 × Type-C |
| Rear USB 2.0 | 4 × Type-A |
| Front USB 5Gbps connector | 1 × Type-C (plus header for 2 additional) |
| Fan headers | 1 × CPU, 1 × CPU OPT, 1 × AIO Pump, 3 × Chassis |
| Power connectors | 24-pin ATX, 8-pin +12V CPU |
| Audio output | 3 × audio jacks, Realtek 7.1 surround sound (24-bit/192 kHz) |
Physical
| Form factor | micro-ATX |
|---|---|
| Dimensions | 9.6" × 9.6" (24.4 cm × 24.4 cm) |
| BIOS | 256 Mb Flash ROM, UEFI AMI |
| Operating systems | Windows 11, Windows 10 64-bit |
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.