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Green micro-ATX board with silver heatsinks and black slots

ASUS

ASUS PRIME B840M-A-CSM AMD motherboard

SKU CH-499X-D2FE8

Micro-ATX AM5 board with B840 chipset, USB-C 3.2 Gen 1, 2.5 Gigabit LAN and 8-channel audio

  • CPU TypeComputer Accessories
  • micro ATX form factor fits compact builds
  • Socket AM5 ready for AMD processors
  • 5 Gigabit LAN delivers fast wired networking
  • ASUS Corporate Stable Model ensures long-term availability

Micro-ATX AM5 board for office builds

The ASUS PRIME B840M-A-CSM is a micro-ATX motherboard built on the AMD B840 chipset for Socket AM5 processors. It includes 2.5 Gigabit LAN, USB 3.2 Gen 1 Type-C and Type-A ports, and 8-channel HD Audio. Onboard video outputs require a CPU with integrated graphics. The CSM designation marks it for stable, long-term supply in commercial deployments.

Check CPU graphics and rear-panel needs

Verify that your chosen AM5 processor provides integrated graphics if you plan to use the board's video outputs. Confirm the rear I/O covers your peripheral count, as the board supplies one USB-C 3.2 Gen 1 and additional USB 3.2 Gen 1 ports. Ensure the micro-ATX form factor fits your chassis and that 2.5 Gigabit LAN matches your network infrastructure.

Highlights

  • micro ATX form factor fits compact builds
  • Socket AM5 ready for AMD processors
  • 5 Gigabit LAN delivers fast wired networking
  • ASUS Corporate Stable Model ensures long-term availability

Specifications

BrandASUS
Model90MB1J10-M0EAYC
CPU TypeComputer Accessories

Questions about this item

What comes in the box with the ASUS PRIME B840M-A-CSM motherboard?

The box contains the micro ATX motherboard with Socket AM5 and AMD B840 chipset, the standard I/O shield and the manual.

Which chipset version does this model use and why choose it?

This model uses the AMD B840 chipset, designed as a Corporate Stable Model for long-term availability and validated stability in business environments.

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