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Green micro ATX motherboard with silver heatsinks and black PCB

ASUS

ASUS PRIME B840M-A WIFI micro ATX Socket AM5 AMD B840 motherboard

SKU CH-7D7Z-JVT49

Micro-ATX AM5 board with 2.5 Gigabit LAN, Wi-Fi 6E, Bluetooth, USB-C 3.2 Gen 1 and 8-channel audio

  • ProcessorComputer Accessories
  • Supports AM5 processors with B840 chipset
  • Fast wired networking via 2.5 Gigabit LAN
  • Wireless freedom with Wi-Fi 6E connectivity
  • Compact micro ATX form factor fits smaller cases

Compact AM5 foundation

The ASUS PRIME B840M-A WIFI is a micro ATX motherboard built around the AMD B840 chipset and Socket AM5. It targets builders who want a compact platform with integrated wireless and wired networking. Onboard graphics output is available when a compatible processor is installed. The board delivers 8-channel HD Audio for everyday multimedia use.

Step up from basic ATX boards

This model replaces larger ATX designs that lack integrated Wi-Fi 6E, Bluetooth and 2.5 Gigabit LAN in a smaller footprint. The jump makes sense when a build needs modern wireless connectivity and a reduced case size without sacrificing the AM5 upgrade path. Builders who require additional expansion slots or more rear USB ports should consider a full-size alternative.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $180.99
Cheaper than about 56% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Model name90MB1J20-M0EAY0
Processor
ProcessorComputer Accessories

Questions about this item

What micro ATX case clearance does the ASUS PRIME B840M-A WIFI need?

The board follows the standard micro ATX form factor, so any case that lists micro ATX support will fit the mounting holes and I/O shield.

Which step do builders often miss when installing the ASUS PRIME B840M-A WIFI?

Many forget to attach the Wi-Fi 6E antenna cables to the rear I/O panel before securing the motherboard in the case.

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