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Micro ATX motherboard in black with reinforced PCIe slot and grey heatsinks

ASUS

ASUS TUF GAMING B550M-PLUS AMD B550 DDR4 128GB Micro ATX Motherboard

SKU CH-NF01-BPNSF

Micro ATX board for Socket AM4 CPUs with AMD B550 chipset and up to 128GB DDR4 memory

  • CPU socketSocket AM4
  • ChipsetAMD B550
  • Max supported RAM128 GB
  • Socket AM4 accepts compatible AMD processors for system builds
  • AMD B550 chipset provides modern platform features
  • DDR4 memory support up to 128GB capacity
  • Micro ATX form factor fits compact chassis designs
  • Includes CMOS battery, SATA cable and I/O shield

Socket AM4 foundation

The ASUS TUF GAMING B550M-PLUS is a Micro ATX motherboard built around the AMD B550 chipset for Socket AM4 processors. It targets builders who need a compact board with validated DDR4 memory support up to 128GB. The form factor fits smaller cases while keeping core platform features.

DDR4 capacity upgrade

Moving to this board makes sense when a current system is limited to lower memory ceilings or an older chipset without B550 feature set. The jump is worth it if the workload demands the full 128GB DDR4 headroom and the AM4 processor lineup matches the performance target.

128GB DDR4 headroom

Four DIMM slots provide a 128GB maximum that handles heavy multitasking, content creation buffers and large dataset workloads comfortably. Headroom runs out when applications exceed the 128GB limit or when the platform requires memory technologies other than DDR4.

How it compares

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

Price $126.99
Cheaper than about 68% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Product lineASUS TUF GAMING B550M-PLUS
Model nameASUS TUF GAMING B550M-PLUS
Processor
CPU socketSocket AM4
ChipsetAMD B550
Memory
Max supported RAM128 GB

Questions about this item

What form factor and socket does the ASUS TUF GAMING B550M-PLUS use for case and CPU mounting?

The board is a Micro ATX model with a Socket AM4 CPU socket, so it fits Micro ATX or larger cases and accepts AM4 processors.

How is the I/O shield handled during installation, and what step is often missed?

A separate chassis I/O back panel is included in the box; install it into the case opening before seating the motherboard, as it cannot be fitted afterward.

Which user-replaceable part is supplied with the board for long-term operation?

A CMOS battery is included in the package for maintaining system settings when the PC is unplugged.

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