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Green Micro ATX motherboard with silver CPU socket and black RAM slots

ASUS

ASUS PRIME B550M-K AMD B550 DDR4 128GB Micro ATX motherboard

SKU CH-8ZY0-SJYTW

Micro ATX board with AM4 socket and B550 chipset supports up to 128GB DDR4 memory

  • CPU socketSocket AM4
  • ChipsetAMD B550
  • Max supported RAM128 GB
  • Supports up to 128GB DDR4 memory for heavy multitasking
  • AMD B550 chipset enables PCIe 4.0 on compatible CPUs
  • Socket AM4 fits a wide range of desktop processors
  • Micro ATX form factor suits compact case builds
  • Includes I/O shield, SATA cable and CMOS battery

Socket AM4 micro-ATX motherboard

The ASUS PRIME B550M-K is a micro-ATX motherboard built on the AMD B550 chipset with a Socket AM4 CPU interface. It accepts DDR4 memory modules up to a total of 128GB, providing a compact foundation for desktop builds that require this specific socket and form factor.

Builders needing AM4 and DDR4 in a small board

This board suits anyone assembling or repairing a system that must use a Socket AM4 processor and DDR4 memory within a micro-ATX chassis. Builders who need a different CPU socket, a different memory generation, or a larger ATX layout should look at alternative models.

128GB DDR4 maximum capacity

The decisive specification is the 128GB maximum memory limit across the DDR4 slots. If your planned configuration requires more memory than this ceiling allows, this motherboard will not meet the requirement and a different board must be chosen.

How it compares

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

Price $118.99
Cheaper than about 70% of the 1,906 comparable items (median $224.49).

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Specifications

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

Questions about this item

What does the 128GB maximum memory mean for my build?

You can install up to 128GB of DDR4 across the board's slots, giving headroom for heavy multitasking or content-creation workloads.

Which storage interface is available and what speed does it cap at?

The board provides SATA ports for 2.5-inch or 3.5-inch drives, limited to the SATA 6Gbps ceiling.

What case and mounting pattern does this Micro ATX board need?

It fits any chassis with Micro ATX or larger ATX standoffs, using the standard four-hole Micro ATX layout.

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