PRIME B840-Plus WiFi Spec and Price in the United States
An ATX AM5 board on the AMD B840 chipset with two x16-length slots, the primary at PCIe 4.0, and three M.2 slots. Four DDR5 DIMM slots hold 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.
Prices exclude sales tax.
The last tracked price for PRIME B840-Plus WiFi in the United States was $158.05 at Amazon.com, captured 2026-10-12. Across one tracked merchant and 104 days of recorded prices, the 90-day median for PRIME B840-Plus WiFi is $174.98 and the lowest recorded price is $100.99. 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.
- PRIME B840-Plus WiFi
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
- B840
- Form factor
- ATX
- Memory type
- DDR5
- RAM slots
- 4
- Max memory
- 256 GB
- M.2 slots
- 3
- PCIe x16 slots
- 2
- PCIe version
- 4.0
- 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.