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A matte-black micro-ATX motherboard with silver heatsinks and a white MSI PRO badge

MSI

MSI PRO B850M-G AMD motherboard

SKU CH-S9DC-WE2ZC

Micro-ATX board for AMD Ryzen 7000, 8000 and 9000 CPUs with DDR5 8200 MT/s support, 7+2+1 power phases, PCIe 5.0 slot and tool-free M.2 installation

  • ProcessorRyzen Series
  • Supports Ryzen 9000, 8000 and 7000 series CPUs
  • DDR5 memory runs at 8200 MT/s overclocked for faster throughput
  • 7+2+1 power phase design with 8-pin CPU connector delivers stable current
  • Extended heatsink, 7W/mK pad and M.2 Frost Armor keep thermals low
  • Tool-free M.2 latch and PCIe 5.0 slot speed up build and storage access

Socket AM5 DDR5 board

The MSI PRO B850M-G is a micro-ATX motherboard built for AMD Ryzen 9000, 8000 and 7000 series desktop processors. It uses the AMD B850 chipset and the AM5 socket to deliver a compact foundation for gaming or workstation builds. Dual-channel DDR5 memory support reaches 8200 MT/s when overclocked.

7+2+1 phase power delivery

A 7+2+1 intelligent power design with an 8-pin CPU connector feeds the socket under sustained loads. The core acceleration engine and memory acceleration engine stabilise voltage during long rendering or compile sessions. A 6-layer server-grade PCB with 2Oz thickened copper reduces resistance and heat build-up over time.

Extended heatsink with 7W/mK pad

An extended heat sink paired with a 7W/mK thermal pad covers the VRM area, while M.2 Frost Armor shields the Lightning Gen 5 x4 M.2 slot. The second-generation tool-free M.2 quick release and extended PCIe latch simplify installation without adding airflow restriction. Thermals stay controlled in normal operation.

How it compares

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

Price $198.99
Typical for this category: the median of 1,906 items is $224.49.

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Specifications

Product
Brand nameMSI
Model namePRO B850M-G
Processor
ProcessorRyzen Series

Questions about this item

How hot does the 7+2+1 power phase run with a Ryzen 9800X3D under all-day load?

The 7+2+1 intelligent power supply with 2Oz copper and 7W/mK thermal pad is designed for high-performance systems, and the extended heatsink plus M.2 Frost Armor help keep temperatures in check during sustained workloads.

Which DDR5 memory kit do I need to reach the 8200 MT/s overclock?

Any DDR5 dual-channel kit rated for 8200+ MT/s (OC) will work; the board's memory acceleration engine and 6-layer server-grade PCB are validated for those speeds with Ryzen 9000, 8000 and 7000 series CPUs.

Will my existing PCIe 4.0 graphics card and M.2 drive run at full speed on the PCIe 5.0 slot and Lightning Gen 5 x4 M.2?

Yes, the PCIe 5.0 slot and Gen 5 x4 M.2 interface are backward compatible, so older PCIe 4.0 devices operate at their native speeds without bottleneck.

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