Prime B860M-A WiFi (-CSM)
The ASUS Prime B860M-A WiFi (-CSM) is a Micro ATX LGA1851 motherboard on the B860 chipset. It supports DDR5 memory up to 8,666 MT/s and 2 M.2 slots. Full specs, power delivery, and current prices are below.
Prices update regularly and may differ at the retailer. This page contains affiliate links.
MaxMyBuild scores
How we score →How well the Prime B860M-A WiFi (-CSM) is equipped for gaming and for productivity, scored 0–100 from its specs. Scores are fit-for-purpose: a capable board can top the gaming score without being the most expensive.
Weighs CPU power delivery, memory speed support, the GPU PCIe slot, Wi-Fi version, and M.2 storage — the things that actually matter for a gaming build.
Rewards fast, plentiful M.2 storage and USB I/O, PCIe expansion, memory capacity and slots — what matters for content creation and heavy multitasking.
CPU power
288 W
Sufficient · 1.1x
Wired for about 288 W, enough for every processor on this socket including the top Core Ultra 9 chips at their 250 W ceiling, without a lot left over. The figure comes from its 7+1+1+1 power-stage (VRM) layout and 8 EPS connectors. It is a rating of what the board is built to deliver, not a measurement, so treat it as headroom rather than a guarantee.
Specifications
Platform
- Chipset
- B860
- Socket
- LGA1851
- Form factor
- Micro ATX
- MSRP
- $170.00
Memory
- Type
- DDR5
- Slots
- 4
- Max speed
- 8,666 MT/s
- Max capacity
- 256 GB
- Channels
- 2-channel
- ECC / memory
- UDIMM, CUDIMM
Power & VRM
- CPU power
- 288 W
- Phase config
- 7+1+1+1
- VRM stages
- 80A DrMOS
- EPS power
- 8
- VRM heatsink
- Full coverage
Storage & Expansion
- M.2 slots
- 2
- M.2 layout
- 1× PCIe 5.0 ×4, 1× PCIe 4.0 ×4
- M.2 heatsinks
- Slots 1
- SATA ports
- 4 SATA3
- PCIe ×16 slots
- 1× PCIe 5.0 ×16, 1× PCIe 4.0 ×4
- Other PCIe slots
- 1× PCIe 4.0 ×1
Ethernet & Wi-Fi
- Realtek RTL8125BG
- 2.5 GbE
- Ethernet ports
- 1
- Wi-Fi
- Wi-Fi 6E
USB & I/O
- Rear USB-A
- 4× USB 2.0, 2× 5 Gbps, 1× 10 Gbps
- Rear USB-C
- 1× 20 Gbps
- Front USB-C
- 1× 10Gbps
- Front USB 3 headers
- 1
- Front USB 2 headers
- 1
- Thunderbolt header
- Yes
Audio & Video
- Audio codec
- ALC897
- Audio jacks
- 3
- HDMI
- HDMI 2.1
- DisplayPort
- 2× DP 1.4
- USB-C video
- None
Cooling, RGB & Design
- Fan headers
- 6
- 12V RGB headers
- 1
- 5V ARGB headers
- 3
- PCB colour
- Black, White
- Heatsink colour
- Silver, Grey
Onboard & Diagnostics
- Diagnostics
- Power/status LEDs
- TPM header
- Yes
Compare the Prime B860M-A WiFi (-CSM) against every other board on the motherboard comparison table. Not sure it fits your chip? The socket compatibility guide explains LGA1851 pairings.
Where to buy the Prime B860M-A WiFi (-CSM)
Every in-stock retailer offer we track, cheapest first.
| Retailer | Availability | Price | Buy |
|---|---|---|---|
| Amazon | In stock | $168.99 |  |
| Newegg | In stock | $178.99 |  |
The Prime B860M-A WiFi (-CSM) starts from $168.99 across 2 retailers (Wi-Fi 6E). Prices update daily from live stock.
Which CPUs fit the Prime B860M-A WiFi (-CSM)?
Compare all CPUs →In-stock LGA1851 processors this board can run, socket-matched and within its 288 W power budget, ranked by gaming value (performance per dollar).
| Processor | Cores | Gaming | From | |
|---|---|---|---|---|
 | Core Ultra 5 225F Intel | 10/10 | 62.5 | $149.99 |
 | Core Ultra 5 245KF Intel | 14/14 | 67.1 | $179.00 |
 | Core Ultra 5 250KF Plus Intel | 18/18 | 73.3 | $199.99 |
 | Core Ultra 5 225 Intel | 10/10 | 62.5 | $178.55 |
 | Core Ultra 5 245K Intel | 14/14 | 67.1 | $193.83 |
 | Core Ultra 5 250K Plus Intel | 18/18 | 73.3 | $212.00 |
 | Core Ultra 7 270K Plus Intel | 24/24 | 77.5 | $290.00 |
 | Core Ultra 7 265KF Intel | 20/20 | 70.3 | $284.00 |
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