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MSI

B550-A PRO Spec and Price in the United Kingdom

AM4B550

An ATX AM4 board on the AMD B550 chipset with two x16-length slots and two M.2 slots. Its four DDR4 DIMM slots hold up to 128GB, and it carries six SATA ports and one rear USB Type-C port. Networking is Gigabit Ethernet, with no onboard Wi-Fi.

Tied 34th of 1869 models in the Motherboards catalog on RAM slots — 1241 models share this figure. Tied 792nd of 1869 models in the Motherboards catalog on Max memory — 720 models share this figure.

Current best price
£89.99at Amazon.co.uk · captured 2026-09-15View at Amazon.co.uk

Captured periodically and may have changed.

Price history

30D90D180DAll
  • B550-A PRO
August 24, 20265 capturestoday · £94.99

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

Specifications

Socket
AM4
Chipset
B550
Form factor
ATX
Memory type
DDR4
RAM slots
4
Max memory
128 GB
M.2 slots
2
PCIe x16 slots
2
SATA ports
6
LAN speed
1 GbE
USB-C ports
1
Wi-Fi
No

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.