Technical Snapshot

The MSI PRO B850M-B GEN4 is a Micro-ATX motherboard based on the B850 chipset for AMD AM5 processors. It supports DDR5 memory with up to 128 GB across 2 DIMM slots, 2.5G 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-B GEN4
MSI PRODUCT
MSI

PRO B850M-B GEN4

B850 · AMD AM5 · Micro-ATX · DDR5 up to 128 GB

CPU socket: AMD AM5. Compatible with AMD Ryzen desktop processors.
SocketAMD AM5
Maximum supported memory: 128 GB DDR5 across 2 DIMM slots.
Max RAM128 GB
B850 chipset with PCIe and M.2 expansion slots.
ChipsetB850
Micro-ATX form factor — compact build compatible.
Form FactorMicro-ATX
MPNPRO B850M-B GEN4
CategoryMotherboards
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Connectivity & Expansion

PCIe x161
M.2 Slots2
SATA Ports4
LAN2.5G LAN
AudioRealtek® ALC8977

Full Specifications

ChipsetB850
SocketAMD AM5
Form FactorMicro-ATX
Memory TypeDDR5
DIMM Slots2
Max RAM128 GB
PCIe x16 Slots1
M.2 Slots2
SATA Ports4
LAN2.5G LAN
AudioRealtek® ALC8977
SeriesPRO

Support & Downloads

Latest Firmware & DriversVisit MSI for the latest updates
MSI Downloads →
MSI PRO B850M-B GEN4 DocumentationPDF · Installation guide and specifications
MSI Support →
← Back to MSI Motherboard Catalog

Frequently Asked Questions

What socket does the MSI PRO B850M-B GEN4 use?

The MSI PRO B850M-B GEN4 uses the AMD AM5 socket, compatible with AMD Ryzen desktop processors.

How much RAM does the MSI PRO B850M-B GEN4 support?

The MSI PRO B850M-B GEN4 supports up to 128 GB of DDR5 memory across 2 DIMM slots.

Does the MSI PRO B850M-B GEN4 have Wi-Fi?

No, the MSI PRO B850M-B GEN4 does not include built-in Wi-Fi.

How many M.2 slots does the MSI PRO B850M-B GEN4 have?

The MSI PRO B850M-B GEN4 has 2 M.2 slots for NVMe SSD storage.

What chipset does the MSI PRO B850M-B GEN4 use?

The MSI PRO B850M-B GEN4 is built on the B850 chipset, offering Micro-ATX form factor design for AMD platforms.

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Product: MSI PRO B850M-B GEN4
MPN: PRO B850M-B GEN4
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Properties: 12 additionalProperty entries