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Micro-ATX motherboard, dark PCB with silver heatsinks, AM5 socket, four DDR5 slots, two M.2 covers, rear I/O shield

MSI

MSI PRO B850M-A WIFI AMD motherboard

SKU CH-975D-R9GKM MPN PRO B850M-A WIFI

Micro-ATX board for AM5 Ryzen 7000, 8000 and 9000 CPUs with DDR5, PCIe 5.0, WiFI 7, Bluetooth 5.4 and 5G LAN

  • CPU Socket TypeAM5
  • CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
  • ChipsetAMD B850
  • Number of Memory Slots4x288pin (DDR5)
  • Memory Standard4 DIMMs, Dual Channel DDR5 – 8200+ MT/s (OC)
  • Channel SupportedDual Channel
  • Supports Ryzen 7000, 8000 and 9000 series processors on AM5 socket
  • DDR5 memory up to 8200 MT/s over four DIMM slots for high bandwidth
  • PCIe 5.0 x16 and M.2 Gen5 at 128 Gbps enable fast GPU and storage
  • WiFI 7 and Bluetooth 5.4 plus Realtek 8126 5G LAN for modern connectivity
  • EZ M.2 Shield Frozr II and extended heatsinks keep thermals under control

Socket AM5 DDR5 motherboard

The MSI PRO B850M-A WIFI is a Micro-ATX board built on the AMD B850 chipset for Ryzen 7000, 8000 and 9000 series processors. It delivers four DDR5 slots supporting 8200 MT/s overclocked speeds in dual-channel mode. The board targets creators and professionals who need current-generation connectivity in a compact form factor.

PCIe 5.0 M.2 slot at 128 Gbps

The primary M.2 socket runs at Gen5 x4 bandwidth, providing 128 Gbps of throughput for the system drive. A second M.2 slot operates at Gen4 x4 64 Gbps for additional storage. This configuration decides whether the board matches a build that requires maximum SSD performance on the primary slot.

5G LAN Wi-FI 7 Bluetooth 5.4

Networking includes a Realtek 8126 5G LAN port, Wi-FI 7 and Bluetooth 5.4 for modern wireless peripherals. Video output is limited to a single HDMI port, so a discrete graphics card is required for display. Four SATA 6Gbps ports and three PCIe slots (5.0 x16, 4.0 x4, 3.0 x1) complete the expansion options.

Highlights

  • Supports Ryzen 7000, 8000 and 9000 series processors on AM5 socket
  • DDR5 memory up to 8200 MT/s over four DIMM slots for high bandwidth
  • PCIe 5.0 x16 and M.2 Gen5 at 128 Gbps enable fast GPU and storage
  • WiFI 7 and Bluetooth 5.4 plus Realtek 8126 5G LAN for modern connectivity
  • EZ M.2 Shield Frozr II and extended heatsinks keep thermals under control

Specifications

BrandMSI
ModelPRO B850M-A WIFI
Part NumberPRO B850M-A WIFI
CPU Socket TypeAM5
CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Memory Standard4 DIMMs, Dual Channel DDR5 – 8200+ MT/s (OC)
Channel SupportedDual Channel
PCI Express 5.0 x161 x PCI Express 5.0 x16
PCI Express 4.0 x161 x PCIe 4.0 x4 slot
PCI Express 3.0 x161 x PCIe 3.0 x1 slot
Serial ATA (SATA)4 x SATA 6Gb/s
M.21 x M.2 Gen5 x4 128Gbps slot,
1 x M.2 Gen4 x4 64Gbps slot,
Audio ChipsetALC897
Audio Channels8-Channel (7.1) HD Audio with Audio Boost
LAN ChipsetRealtek®
8126 5G LAN
Wireless LANWiFI 7
BluetoothBluetooth 5.4
HDMI1 x HDMI
RJ451 x RJ45
DisplayPort1 x DisplayPort
USB 3.13 x USB 10Gbps Type-A
3 x USB 5Gbps Type-A
USB Type-C2 x USB 10Gbps Type-C
Audio Ports8-Channel(7.1)HD Audio with Audio Boost
Onboard USB4x USB 2.0
2x USB 5Gbps Type-A
1x USB 10Gbps type-C
Form FactorMicro ATX
FeaturesClear CMOS Button & Flash BIOS Button on back panel.
Shipping weight1.25 kg
Package size279 × 277 × 79 mm

Questions about this item

How does DDR5 at 8200 MT/s behave once the board is built?

The memory controller runs dual-channel DDR5 and the BIOS exposes an 8200+ MT/s overclock profile; actual speed depends on the CPU memory controller and the DIMM kit you install.

What does the PCIe 5.0 x16 slot and the Gen5 M.2 cap at in practice?

The primary x16 slot is wired for PCIe 5.0 and the top M.2 runs at Gen5 x4 (128 Gbps); the second M.2 is Gen4 x4 (64 Gbps) and the remaining slots are Gen4 x4 and Gen3 x1.

What physical clearance does the Micro-ATX board and AM5 socket need?

The board follows the Micro-ATX form factor with an AM5 socket and standard mounting holes, so it fits any chassis that lists Micro-ATX support and provides the AM5 keep-out zone.

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