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MSI

PRO B850-S WiFi6E Spec and Price in the United Kingdom

AM5B850

An ATX AM5 board built on the AMD B850 chipset, pairing two x16-length slots, the primary wired to PCIe 4.0, with two M.2 slots. It accepts four DDR5 DIMMs up to 256GB, along with four SATA ports and one rear USB Type-C port. Wi-Fi 6E handles wireless, with 2.5 Gigabit Ethernet wired.

Tied 34th of 1869 models in the Motherboards catalog on RAM slots — 1241 models share this figure. Tied 14th of 1869 models in the Motherboards catalog on Max memory — 707 models share this figure.

Current best price
£109.99at Amazon.co.uk · captured 2026-09-15View at Amazon.co.uk

Captured periodically and may have changed.

Price history

30D90D180DAll
  • PRO B850-S WiFi6E
August 24, 20265 capturestoday · £128.29

Each point is one capture, not a list price. How we track prices

Specifications

Socket
AM5
Chipset
B850
Form factor
ATX
Memory type
DDR5
RAM slots
4
Max memory
256 GB
M.2 slots
2
PCIe x16 slots
2
PCIe version
4.0
SATA ports
4
LAN speed
2.5 GbE
USB-C ports
1
Wi-Fi
Yes

Guides for this category

How to choose a motherboardThe socket decides which processor goes in; chipset, form factor, memory support and the slot counts decide whether the rest of the build fits around it.

Sources

Every spec above was pulled from one of these — a field a source didn't state was left off rather than estimated.