B850M-A Spec and Price in the United States
A Micro-ATX AM5 board on the AMD B850 chipset with two x16-length slots, the primary at PCIe 5.0, and two M.2 slots. Its two DDR5 DIMM slots hold up to 128GB, and it carries four SATA ports and one rear USB Type-C port. Networking is onboard Wi-Fi with 2.5 Gigabit Ethernet.
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.
Prices exclude sales tax.
The last tracked price for B850M-A in the United States was $159.99 at Amazon.com, captured 2026-10-12. Across one tracked merchant and 96 days of recorded prices, the 90-day median for B850M-A is $159.99 and the lowest recorded price is $129.98. This site began capturing prices on July 30, 2026; for Amazon listings, prices dated earlier come from Keepa's price history.
Captured periodically and may have changed.
- B850M-A
Each point is one day's recorded price, not a list price. Points dated before July 30, 2026, when this site began capturing prices, come from Keepa's Amazon price history. How we track prices
Specifications
- Socket
- AM5
- Chipset
- B850
- Form factor
- Micro-ATX
- Memory type
- DDR5
- RAM slots
- 2
- Max memory
- 128 GB
- M.2 slots
- 2
- PCIe x16 slots
- 2
- PCIe version
- 5.0
- SATA ports
- 4
- LAN speed
- 2.5 GbE
- USB-C ports
- 1
- Wi-Fi
- Yes
Guides for this category
Sources
Every spec above was pulled from one of these — a field a source didn't state was left off rather than estimated.