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Green Micro ATX motherboard with silver AM4 socket and black DDR4 slots

ASUS

ASUS PRIME B450M-A II AMD motherboard

SKU CH-5NC5-7AE1W

Micro-ATX board with AMD B450 chipset, Socket AM4 and DDR4 memory up to 128 GB

  • CPU socketSocket AM4
  • ChipsetAMD B450
  • Max supported RAM128 GB
  • Supports up to 128GB DDR4 memory for demanding workloads
  • AMD B450 chipset enables Socket AM4 processor compatibility
  • Micro ATX form factor fits compact chassis builds
  • Includes SATA cable for storage connectivity
  • 100% full inspection performed before shipping

Socket AM4 B450 platform

The ASUS PRIME B450M-A II is a Micro ATX motherboard built around the AMD B450 chipset for Socket AM4 processors. It supports DDR4 memory up to 128GB, giving builders a compact foundation for mainstream desktops or workstations. The board includes a chassis I/O back panel, one SATA cable and a CMOS battery in the package.

Sustained workload behaviour

The B450 chipset delivers stable throughput for extended multi-threaded tasks such as rendering or compiling without the throttling seen in brief burst tests. Power delivery remains consistent across long sessions, letting the attached CPU hold its operating frequency. Memory runs at the rated DDR4 speeds continuously when populated within the 128GB limit.

Thermals, noise and power draw

Passive chipset cooling keeps the board silent under typical desktop loads while the VRM area stays within normal operating temperatures. System power draw scales with the chosen CPU and memory configuration rather than the board itself. The included SATA cable and I/O shield simplify assembly without adding active cooling components.

How it compares

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

Price $108.99
Cheaper than about 73% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS
Product lineASUS PRIME B450M-A II
Model nameASUS PRIME B450M-A II
Processor
CPU socketSocket AM4
ChipsetAMD B450
Memory
Max supported RAM128 GB

Questions about this item

Does the ASUS PRIME B450M-A II include any active cooling or fan headers that affect noise when the system runs all day?

The board relies on the CPU cooler and case fans you install; it has standard fan headers but no integrated active cooling of its own.

Which components must I already own — CPU, memory and storage — for this Socket AM4 board to function?

You need an AM4 processor, DDR4 modules up to 128 GB total, a SATA drive or other boot device, and an ATX power supply with 24-pin and 4-pin CPU connectors.

Will my existing DDR4 memory and SATA drives work straight away on this B450 Micro ATX board?

Yes — the board accepts DDR4 up to 128 GB and provides SATA ports, so compatible modules and drives are recognised without extra adapters.

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