Technical Snapshot

The MSI PRO B850M-A is a Micro-ATX motherboard based on the B850 chipset for AMD AM5 processors. It supports DDR5 memory with up to 256 GB across 4 DIMM slots, 5G LAN LAN, and 2 M.2 slots.

Use Case
Desktop PC builds, gaming, workstation
Compatibility
AMD AM5 processors
Category
Micro-ATX Motherboard — B850 Chipset
MSI PRO B850M-A
MSI PRODUCT
MSI

PRO B850M-A

B850 · AMD AM5 · Micro-ATX · DDR5 up to 256 GB

CPU socket: AMD AM5. Compatible with AMD Ryzen desktop processors.
SocketAMD AM5
Maximum supported memory: 256 GB DDR5 across 4 DIMM slots.
Max RAM256 GB
B850 chipset with PCIe and M.2 expansion slots.
ChipsetB850
Micro-ATX form factor — compact build compatible.
Form FactorMicro-ATX
MPNPRO B850M-A
CategoryMotherboards
Contact for Price
Comparing motherboards? Open Comparison Tool →

Connectivity & Expansion

PCIe x162
M.2 Slots2
SATA Ports4
LAN5G LAN
AudioRealtek® ALC8977

Full Specifications

ChipsetB850
SocketAMD AM5
Form FactorMicro-ATX
Memory TypeDDR5
DIMM Slots4
Max RAM256 GB
PCIe x16 Slots2
M.2 Slots2
SATA Ports4
LAN5G LAN
AudioRealtek® ALC8977
SeriesPRO

Support & Downloads

Latest Firmware & DriversVisit MSI for the latest updates
MSI Downloads →
MSI PRO B850M-A DocumentationPDF · Installation guide and specifications
MSI Support →
← Back to MSI Motherboard Catalog

Frequently Asked Questions

What socket does the MSI PRO B850M-A use?

The MSI PRO B850M-A uses the AMD AM5 socket, compatible with AMD Ryzen desktop processors.

How much RAM does the MSI PRO B850M-A support?

The MSI PRO B850M-A supports up to 256 GB of DDR5 memory across 4 DIMM slots.

Does the MSI PRO B850M-A have Wi-Fi?

No, the MSI PRO B850M-A does not include built-in Wi-Fi.

How many M.2 slots does the MSI PRO B850M-A have?

The MSI PRO B850M-A has 2 M.2 slots for NVMe SSD storage.

What chipset does the MSI PRO B850M-A use?

The MSI PRO B850M-A is built on the B850 chipset, offering Micro-ATX form factor design for AMD platforms.

JSON-LD Structured Data — Product + FAQ + Breadcrumb 
Product: MSI PRO B850M-A
MPN: PRO B850M-A
Schemas: Product + BreadcrumbList + FAQPage
Properties: 12 additionalProperty entries