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MSI

PRO B840M-B Spec and Price in Canada

AM5B840

A Micro-ATX AM5 board on the AMD B840 chipset with a single PCIe 4.0 x16 slot and two M.2 slots. Its two DDR5 DIMM slots hold up to 128GB, and it carries four SATA ports, with 2.5 Gigabit Ethernet and no onboard Wi-Fi.

Tied 1275th of 1869 models in the Motherboards catalog on RAM slots — 595 models share this figure. Tied 792nd of 1869 models in the Motherboards catalog on Max memory — 720 models share this figure.

Current best price
$154.99at Amazon.ca · captured 2026-09-15View at Amazon.ca

Captured periodically and may have changed.

Price history

30D90D180DAll
  • PRO B840M-B
March 20, 202681 capturestoday · $179.99

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

Specifications

Socket
AM5
Chipset
B840
Form factor
Micro-ATX
Memory type
DDR5
RAM slots
2
Max memory
128 GB
M.2 slots
2
PCIe x16 slots
1
PCIe version
4.0
SATA ports
4
LAN speed
2.5 GbE
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.