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Green microATX motherboard with silver heatsinks and black slots

ASUS

ASUS Prime B450M-A/CSM AMD motherboard

SKU CH-RSF5-MWVY4

Supports 2nd generation AMD Ryzen AM4 processors with DDR4 memory, NVMe M.2, USB 3.1 Gen2 and Gigabit LAN in a microATX board featuring 5X Protection III hardware safeguards and Aura Sync RGB header

  • Supports 2nd generation Ryzen processors for responsive performance
  • DDR4 memory compatibility enables efficient multitasking with lower power draw
  • 5X Protection III safeguards components for extended hardware lifespan
  • Aura Sync RGB header synchronizes lighting across compatible devices
  • Micro ATX form factor fits compact builds while retaining expansion slots

Micro ATX motherboard for Ryzen 2

The ASUS Prime B450M-A/CSM is a microATX board built for 2nd generation AMD Ryzen processors on the AM4 socket. It targets system builders who need a compact foundation with corporate-grade lifecycle support and advance replacement coverage. The layout fits smaller chassis while keeping essential expansion and connectivity intact.

Builders needing long-term stability — not extreme

This board suits offices and integrators who value a guaranteed long product lifecycle and complimentary advance replacement over enthusiast voltage headroom. Buyers who want multi-GPU configurations or the highest memory overclocking headroom should look at something else, as the microATX form factor and B450 chipset limit those scenarios.

NVMe M.2 slot for primary storage speed

A single NVMe M.2 interface provides the fastest onboard pathway for the operating system and applications. The slot connects directly to the processor, so storage throughput depends on the installed Ryzen CPU. If a build requires multiple high-speed M.2 drives, this board cannot accommodate that need.

How it compares

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

Price $66.99
Cheaper than about 87% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameASUS

Questions about this item

Which processor generation is required for this motherboard to operate?

The board is powered by 2nd generation AMD Ryzen AM4 processors, so a compatible CPU from that lineup must be installed.

Will my existing DDR4 memory modules work with this board?

Yes, the motherboard provides DDR4 SDRAM slots that allow the memory to run at effective bus speed with minimal power draw.

How can I verify the RGB lighting is functioning after assembly?

Connect compatible devices to the Aura Sync RGB header and use the Aura Sync software to confirm synchronization across the ecosystem.

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