Mag B860 Tomahawk
The MSI Mag B860 Tomahawk is a ATX LGA1851 motherboard on the B860 chipset. It supports DDR5 memory up to 9,200 MT/s and 3 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 Mag B860 Tomahawkis 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.
Max CPU power
300 W
The Mag B860 Tomahawk can reliably power a CPU drawing up to about 300 W from its 2x6+1+1+1 power-stage (VRM) layout. That’s the number that decides whether a board can run a power-hungry chip at full boost without throttling — comfortable for even the top Core Ultra 9 chips.
Specifications
Platform
- Chipset
- B860
- Socket
- LGA1851
- Form factor
- ATX
- MSRP
- $230.00
Memory
- Type
- DDR5
- Slots
- 4
- Max speed
- 9,200 MT/s
- Max capacity
- 256 GB
- Channels
- 2-channel
- ECC / memory
- UDIMM, CUDIMM
Power & VRM
- Max CPU power
- 300 W
- Phase config
- 2x6+1+1+1
- VRM stages
- 60A SPS
- EPS power
- 8+8
- VRM heatsink
- Full coverage
Storage & Expansion
- M.2 slots
- 3
- M.2 layout
- 1× PCIe 5.0 ×4, 2× PCIe 4.0 ×4
- M.2 heatsinks
- All slots
- 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
- Killer E5000
- 5 GbE
- Ethernet ports
- 1
- Wi-Fi
- Wi-Fi 7
USB & I/O
- Rear USB-A
- 4× USB 2.0, 4× 10 Gbps
- Rear USB-C
- 1× 10 Gbps, 1× USB4 40 Gbps
- Front USB-C
- 1× 10Gbps
- Front USB 3 headers
- 1
- Front USB 2 headers
- 2
- Thunderbolt header
- Yes
Audio & Video
- Audio codec
- ALC897
- Audio jacks
- 2
- S/PDIF out
- Yes
- HDMI
- HDMI 2.1
- DisplayPort
- DP 1.4
- USB-C video
- DP 2.1
Cooling, RGB & Design
- Fan headers
- 7
- 12V RGB headers
- 2
- 5V ARGB headers
- 3
- PCB colour
- Black
- Heatsink colour
- Dark Grey, Lime
Onboard & Diagnostics
- BIOS Flashback
- Yes (rear)
- Diagnostics
- Debug LEDs
- Onboard buttons
- Clear CMOS
- TPM header
- Yes
- Aux PCIe power
- 1 8-pin
Compare the Mag B860 Tomahawk 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 Mag B860 Tomahawk
Every in-stock retailer offer we track, cheapest first.
| Retailer | Availability | Price | Buy |
|---|---|---|---|
| Amazon | — | See on Amazon |  |
| B&H | In stock | $220.00 |  |
The Mag B860 Tomahawk starts from $159.99 across 2 retailers (Wi-Fi 7). Prices update daily from live stock.
Which CPUs fit the Mag B860 Tomahawk?
Compare all CPUs →In-stock LGA1851 processors this board can run — socket-matched and within its 300 W VRM budget, ranked by gaming value (performance per dollar).
| Processor | Cores | Gaming | From | |
|---|---|---|---|---|
 | Core Ultra 5 225F Intel | 10/10 | 62.5 | $154.00 |
 | Core Ultra 5 245K Intel | 14/14 | 67.1 | $179.99 |
 | Core Ultra 5 250KF Plus Intel | 18/18 | 73.3 | $199.95 |
 | Core Ultra 5 225 Intel | 10/10 | 62.5 | $178.00 |
 | Core Ultra 5 245KF Intel | 14/14 | 67.1 | $199.00 |
 | Core Ultra 5 250K Plus Intel | 18/18 | 73.3 | $219.99 |
 | Core Ultra 7 270K Plus Intel | 24/24 | 77.5 | $308.00 |
 | Core Ultra 265KF Intel | 20/20 | 70.3 | $292.00 |
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