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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

  • ProcessorComputer 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.

How it compares

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

Price $199.99
Typical for this category: the median of 1,906 items is $224.49.

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Specifications

Product
Brand nameASUS
Model name90MB1J10-M0EAYC
Processor
ProcessorComputer 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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