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ASUS

PRIME B840M-A WiFi-CSM 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 three M.2 slots. Four DDR5 DIMM slots take up to 256GB, and it carries four SATA ports and one rear USB Type-C port. Networking is onboard Wi-Fi 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
$259.99at Amazon.ca · captured 2026-09-15View at Amazon.ca

Captured periodically and may have changed.

Price history

30D90D180DAll
  • PRIME B840M-A WiFi-CSM
July 11, 202630 capturestoday · $259.99

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
4
Max memory
256 GB
M.2 slots
3
PCIe x16 slots
1
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.