ASRock

B850 Pro-A Spec and Price in the United Kingdom

Name: B850 Pro-A
Brand: ASRock

AM5B850

Built on the AMD B850 chipset, this ATX AM5 board offers two x16-length slots with the primary at PCIe 5.0, along with four M.2 slots. Its four DDR5 DIMM slots hold up to 256GB, and it provides two SATA ports plus two rear USB Type-C ports. Wireless is onboard Wi-Fi, paired with 2.5 Gigabit Ethernet.

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

£133.47at Amazon.co.uk · captured 2026-09-15View at Amazon.co.uk

Captured periodically and may have changed.

Specifications

Socket: AM5
Chipset: B850
Form factor: ATX
Memory type: DDR5
RAM slots: 4
Max memory: 256 GB
M.2 slots: 4
PCIe x16 slots: 2
PCIe version: 5.0
SATA ports: 2
LAN speed: 2.5 GbE
USB-C ports: 2
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.

ASRock