ASUS
ASUS ROG Maximus Z890 Hero
LGA1851 · Z890 · ATX
8.7
$450Nov 93 videos
MSI MAG B850M Mortar WiFi
Micro-ATX B850 board with Wi-Fi 7, 5Gb LAN, a Gen5 GPU slot and two Gen5 M.2 slots.
- AM5
- B850
- Micro-ATX
- DDR5
- 3
PCPR score
7.8
Good
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R1
The short version
The MAG B850M Mortar WiFi is MSI's mid-range micro-ATX B850 board. It has a PCIe 5.0 x16 slot, three M.2 slots (two PCIe 5.0), Wi-Fi 7, 5Gb Ethernet and a 20Gbps rear USB-C port. Compact builders get a feature set normally seen on ATX boards, though there is only one extra PCIe 4.0 x4 slot and no 22110 support.
Pros
- Wi-Fi 7 and 5Gb LAN on a micro-ATX board
- Two PCIe 5.0 x4 M.2 slots
- 20Gbps USB-C on the rear panel
- Flash BIOS button
Cons
- No 22110 M.2 support
- Only one extra PCIe slot
- M.2_3 runs at PCIe 4.0 x2 only
Best for
- Compact Ryzen 9000 gaming builds
J3
Full specifications
Core
- Socket
- AM5
- Chipset
- B850
- Form factor
- Micro-ATX
Memory
- Memory type
- DDR5
- Memory slots type
- DIMM
- Memory slots
- 4
- Max memory
- 256 GB
- Max memory speed (OC)
- 8,200 MT/s
Expansion
- M.2 slots
- 3
- M.2 PCIe 5.0 slots
- 2
- M.2 PCIe 4.0 slots
- 1
- M.2 PCIe 3.0 slots
- 0
- Supports M.2 22110
- No
- SATA ports
- 4
- PCIe x16 slots
- 1
- Primary PCIe slot version
- 5.0
- PCIe x4 slots
- 1
- PCIe x1 slots
- 0
Connectivity
- Wi-Fi
- Wi-Fi 7
- Bluetooth
- 5.4
- Ethernet speed
- 5 GbE
- Ethernet ports
- 1
Ports & I/O
- USB4 / Thunderbolt ports
- 0
- Rear USB-C ports
- 2
- Rear USB-A ports
- 7
- Front USB-C header
- Yes
- USB 3 headers
- 1
- USB 2 headers
- 2
- HDMI outputs (iGPU)
- 1
- DisplayPort outputs (iGPU)
- 0
Cooling
- Fan headers
- 6
- ARGB headers (5V)
- 3
- RGB headers (12V)
- 1
Power
- CPU power
- 2 x 8-pin
Fit
- Back-connect (BTF / Project Zero)
- No
Features
- BIOS flashback
- Yes
Physical
- Color
- Black
Compatibility notes
- Micro-ATX board (244 x 244 mm).
- M.2_3 accepts 2280 drives only.
P1
Where to buy
- Buy from the maker
MSI official page
Direct link
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AV1
Video reviews
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AV2
What reviewers and owners say
r/watercooling · u/Valdair
CriticalAn owner found the board stopped detecting the CPU stick in DIMMA2 after a watercooling rebuild, with debug LEDs showing no CPU or memory detected; booting with only DIMMB2 populated worked.
2026-09-22
Read the source
Summaries are written in our words. Follow the links for each source’s own review.
R9
Common questions
Is it micro-ATX?
Yes, it measures 243.84 x 243.84 mm and fits micro-ATX and ATX cases.
Does it include Wi-Fi 7?
Yes, a Wi-Fi 7 module with Bluetooth 5.4 is pre-installed.
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