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ASUS PRIME B850M-A micro-ATX motherboard with black PCB and silver heatsinks

ASUS

ASUS PRIME B850M-A AMD motherboard AM5 DDR5

SKU CH-D0C1-F3M47

Micro-ATX AM5 board with DDR5 up to 8000 MT/s, 128 Gbps M.2 bandwidth, PCIe 5.0 slot, Realtek 2.5 Gb Ethernet, front USB 5.0 Type-C, BIOS FlashBack and Aura Sync RGB control

  • CPU socketAM5
  • Stable power delivery with 8+2+1 power modules and 6-layer PCB
  • DDR5 speeds up to 8000 MT/s overclocked for responsive performance
  • VRM heatsinks, M.2 heatsinks and water-pump header keep temperatures controlled
  • PCIe 5.0 slot and Realtek 2.5 Gb Ethernet enable fast data transfer
  • Aura Sync and addressable ARGB header let you personalise lighting

AM5 DDR5 micro-ATX motherboard

The ASUS PRIME B850M-A is built for AMD AM5 processors and DDR5 memory on a micro-ATX form factor. It delivers an 8+2+1 power stage design on a six-layer PCB with Digi+ VRM control for stable operation. Three M.2 sockets provide high-speed storage expansion while a Realtek 2.5 Gb Ethernet port handles wired networking.

Builders who need AM5 and DDR5 on a compact board

This board suits builders assembling a micro-ATX system with an AM5 CPU and DDR5 memory who want PCIe 5.0 readiness and 2.5 Gb Ethernet. It is not for buyers who require a full-size ATX layout with additional expansion slots. It is also not for builders who need integrated Wi-Fi or more than three M.2 sockets.

DDR5 8000 MT/s overclock ceiling

The maximum supported DDR5 data rate is 8000 MT/s when overclocked, which defines the memory performance headroom for this platform. Buyers planning to run memory beyond this frequency should look at a different motherboard. The 8+2+1 power design and six-layer PCB are engineered to support this level of memory tuning.

How it compares

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

Price $191.99
Cheaper than about 55% of the 1,906 comparable items (median $224.49).

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Specifications

Processor
CPU socketAM5

Questions about this item

How do I install the motherboard into a micro-ATX case and which standoff step is commonly missed?

Mount the board on the micro-ATX standoff pattern, then secure every hole; the centre standoff is often left out and causes flex.

What maintenance will the VRM heatsinks and M.2 heatsinks need over time?

Clean dust from the VRM heatsinks, thermal pads and M.2 heatsinks periodically; replace thermal pads if they degrade.

Which limit appears first when the board runs sustained loads?

The 8+2+1 power modules and VRM heatsinks set the thermal ceiling before the DDR5 8000 MT/s OC headroom is reached.

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