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Green Micro ATX motherboard with silver heatsinks and black slots

ASUS

ASUS PRIME B550M-A AMD B550 DDR4 128GB Micro ATX Motherboard

SKU CH-0WC3-0BZC8

Micro ATX board with AMD B550 chipset, Socket AM4 and DDR4 support up to 128 GB

  • CPU socketSocket AM4
  • ChipsetAMD B550
  • Max supported RAM128 GB
  • Socket AM4 supports AMD processors for flexible CPU choice
  • AMD B550 chipset delivers PCIe 4.0 connectivity for faster storage and graphics
  • 128GB maximum DDR4 memory capacity enables heavy multitasking and content creation
  • Micro ATX form factor fits compact cases while keeping full expansion
  • Includes I/O shield, SATA cable and CMOS battery for immediate build readiness

Socket AM4 B550 Micro ATX Motherboard

The ASUS PRIME B550M-A is a Micro ATX board built for AMD Socket AM4 processors using the B550 chipset. It supports up to 128GB of DDR4 memory across four slots. The compact form factor fits smaller chassis while keeping core platform features.

Bundled I/O Shield, Battery and SATA Cable

The package adds a chassis I/O back panel, a CMOS battery and one SATA cable so the board can be installed and a drive connected immediately. No Wi-Fi antenna is supplied because the board lacks an integrated wireless module. No other accessories are included.

128GB DDR4 Capacity and Expansion Headroom

Four DIMM slots provide a 128GB ceiling, enough for heavy multitasking and content workloads. The single included SATA cable covers one drive; additional cables are needed for more SATA devices. Memory beyond 128GB is not supported by the chipset.

How it compares

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

Price $139.99
Cheaper than about 64% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Product lineASUS PRIME B550M-A
Model nameASUS PRIME B550M-A
Processor
CPU socketSocket AM4
ChipsetAMD B550
Memory
Max supported RAM128 GB

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