Compare 12 documented AMD B840 board models. Platform labels are only a starting point; exact support is model-specific.
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Compare documented models
This group contains 12 exact board records. Documented socket values: AM5; memory generations: DDR5; chipset labels: amd-b840. M.2 slot IDs extracted per model range from 2 to 3, but a zero means the slot map was not established in this catalog.
| Board | Socket | DDR | Documented M.2 slots |
|---|---|---|---|
| PRIME B840-PLUS WIFI-CSM | AM5 | DDR5 | 3 |
| PRIME B840M-A WIFI-CSM | AM5 | DDR5 | 3 |
| PRIME B840M-A WIFI | AM5 | DDR5 | 3 |
| PRIME B840M-A-CSM | AM5 | DDR5 | 3 |
| PRIME B840M-R-CSM | AM5 | DDR5 | 2 |
| B840M AYW GAMING WIFI | AM5 | DDR5 | 2 |
| B840M MAX GAMING AX | AM5 | DDR5 | 3 |
| PRIME B840-PLUS WIFI | AM5 | DDR5 | 3 |
| PRIME B840M-A | AM5 | DDR5 | 3 |
| PRIME B840M-K-CSM | AM5 | DDR5 | 2 |
| PRIME B840M-K | AM5 | DDR5 | 2 |
| PRIME B840M-R | AM5 | DDR5 | 2 |
Why the model still matters
A shared chipset does not transfer a CPU BIOS minimum, memory QVL entry, M.2 lane rule or PCB revision from one board to another. Open the exact board page and its official source before buying.
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Sources & verification
Manufacturer pages were checked on 2026-10-29. Recheck the current page before purchase.
- ASUS PRIME B840-PLUS WIFI-CSM technical specifications Checked 2026-10-29
- ASUS PRIME B840M-A WIFI-CSM technical specifications Checked 2026-10-29
- ASUS PRIME B840M-A WIFI technical specifications Checked 2026-10-29
- ASUS PRIME B840M-A-CSM technical specifications Checked 2026-10-29
- ASUS PRIME B840M-R-CSM technical specifications Checked 2026-10-29
- ASUS B840M AYW GAMING WIFI technical specifications Checked 2026-10-29
- ASUS B840M MAX GAMING AX technical specifications Checked 2026-10-29
- ASUS PRIME B840-PLUS WIFI technical specifications Checked 2026-10-29
- ASUS PRIME B840M-A technical specifications Checked 2026-10-29
- ASUS PRIME B840M-K-CSM technical specifications Checked 2026-10-29
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