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The short answer:
if you specifically want B840, I would start with the MSI B840 GAMING
PLUS WIFI for a normal ATX gaming PC. Choose the ASUS PRIME B840-PLUS
WIFI when you need three onboard M.2 positions, or the GIGABYTE B840M
AORUS ELITE WIFI6E for a more compact Micro-ATX build. Before buying
any of them, compare the current price with a good B850 board.
Last reviewed: August 17, 2026
AMD B840 is the entry point into the current 800-series AM5 platform, but its limitations are important to understand before choosing a board.
You still get DDR5, AMD EXPO memory overclocking and support for current AM5 Ryzen processors. What you do not get from the B840 platform is PCIe 5.0 or AMD-supported Ryzen CPU overclocking.
That makes B840 most attractive when the motherboard is meaningfully cheaper than a B850 alternative and your build is straightforward: one graphics card, a few SSDs, normal networking and no need for CPU overclocking.
Socket
AMD AM5
Graphics baseline
PCIe 4.0 x16
PCIe 5.0 lanes
0
CPU overclocking
No
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