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Micro-ATX motherboard, black PCB with silver heatsinks

MSI

MSI MAG B850M MORTAR WIFI AMD motherboard

SKU CH-FYSV-28A6R MPN MAG B850M MORTAR WIFI

Micro-ATX AM5 board with DDR5 up to 8200 MT/s, PCIe 5.0 graphics and storage slots, Wi-Fi 7, 5G LAN and 20 Gbps USB

  • ProcessorRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
  • ChipsetAMD B850
  • Form factorMicro ATX
  • CPU socketAM5
  • Memory slot count4 × 288pin (DDR5)
  • Supported memorySupport DDR5 8200–5600 (OC) MT/s / 5600–4800 (JEDEC) MT/s
  • Ready for Ryzen 7000, 8000 and 9000 series processors with AM5 socket
  • DDR5 memory up to 8200 MT/s overclocked across four slots for 256 GB capacity
  • PCIe 5.0 x16 graphics slot and two PCIe 5.0 M.2 slots for fastest GPUs and storage
  • Realtek ALC4080 codec delivers 7.1 channel high-definition audio
  • Wi-Fi 7 wireless and 5G LAN plus USB 20Gbps for high-speed connectivity

AM5 Micro-ATX for Ryzen 7000 to 9000

The MSI MAG B850M MORTAR WIFI is a micro-ATX motherboard built around the AMD B850 chipset for socket AM5. It supports Ryzen 7000, 8000 and 9000 series processors, giving builders a compact platform for current and upcoming CPUs. Four DDR5 slots accept up to 256 GB of memory, making it suited to gaming rigs and workstations that need high capacity in a smaller case.

VRM heatsinks and fan headers manage thermals

Extended VRM heatsinks cover the power delivery for stable operation under load. Multiple fan headers let the board control case and CPU airflow, keeping noise low during everyday tasks. The B850 chipset runs efficiently, so system power draw stays predictable whether the PC is idling or pushing high memory speeds such as DDR5 8200 MT/s overclocked.

PCIe 5.0 x16 and dual M.2 free up expansion

The primary PCIe 5.0 x16 slot connects directly to the CPU for Ryzen 9000 and 7000 chips, while Ryzen 8000 series runs at PCIe 4.0 x8. Two M.2 slots both support PCIe 5.0 x4 on newer CPUs, and four SATA 6 Gb/s ports handle additional drives. Realtek ALC4080 audio delivers 7.1 channels, while Wi-Fi 7 and 5 Gb LAN provide modern networking without extra cards.

How it compares

Measured against everything we stock in Motherboards for AMD CPUs, at today’s prices. Recalculated every night.

Price $178.99
Cheaper than about 57% of the 1,906 comparable items (median $224.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameMSI
Model nameMAG B850M MORTAR WIFI
Processor
ProcessorRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
CPU socketAM5
ChipsetAMD B850
Memory
Memory slot count4 × 288pin (DDR5)
Supported memorySupport DDR5 8200–5600 (OC) MT/s / 5600–4800 (JEDEC) MT/s
Max supported RAM256 GB
Memory channelsDual Channel
Memory profilesAMD EXPO
ECC supportNon-ECC
BufferingUn-buffered
Storage
SATA ports4 x SATA 6Gb/s
M.2 slotsM2_1 slot
- Supports up to PCIe 5.0 x4 (For Ryzen 9000/ 7000 Series processors)
- Supports up to PCIe 4.0 x4 (For Ryzen 8000 Series processors)
M2_2 slot
- Supports up to PCIe 5.0 x4 (For Ryzen 9000/ 7000 Series processors)
- Supports up to PCIe 4.0 x4 (For Ryzen 8700/ 8600/ 8400 Series processors)
- Supports up to PCIe 4.0 x2 (For Ryzen 8500/ 8300 Series processors)
M2_3 slot
- Supports up to PCIe 4.0 x2
Audio & video
Audio chipRealtek ALC4080
Sound channels7.1 Channels
Connectivity
Maximum network speed5 Gbit/s
Wi-Fi standardWi-Fi 802.11 be
Bluetooth support5.4
Ports & slots
PCIe 5.0 x16 slotsPCI_E1 Gen PCIe 5.0 supports up to x16 (From CPU)
PCI_E1 slot
- Supports PCIe 5.0 x16 (For Ryzen 9000/ 7000 Series processors)
- Supports PCIe 4.0 x8 (For Ryzen 8700/ 8600/ 8400 Series processors)
- Supports PCIe 4.0 x4 (For Ryzen 8500/ 8300 Series processors)
PCIe 4.0 x16 slotsPCI_E2 Gen PCIe 4.0 supports up to x4 (From Chipset)
Onboard USB headers4 x USB 2.0 ports
2 x USB 5 Gbit/s Type A ports
1 x USB 10 Gbit/s Type C ports
Power
Power connectors1 x Power Connector(ATX_PWR)
2 x Power Connector(CPU_PWR)
1 x Power Connector(PCIE_PWR 8pin)
Size & build
Form factorMicro ATX
Width and length9.6 in × 9.6 in
Shipping weight1.81 kg
Package size282 × 274 × 71 mm
Compatibility
Windows 11 supportSupport for Windows 11 64-bit

Questions about this item

How do I install the CPU into the AM5 socket and what step do builders often miss?

Lift the socket lever, align the triangle on the Ryzen processor with the socket marker, place the chip gently without pressure, lower the frame and lock the lever; the step often missed is removing the protective plastic cover from the socket before insertion.

What maintenance will the board need later and which component is involved?

The only user-serviceable part is the M.2 slot covers; keep them in place when drives are absent to prevent dust buildup and clean the heatsink fins with compressed air during routine system cleaning.

Which limit appears first under sustained heavy load on this motherboard?

VRM thermal throttling is the first limit; the 10-phase power delivery handles Ryzen 7000, 8000 and 9000 series CPUs, but prolonged all-core workloads can raise MOSFET temperatures enough to reduce clock speeds before other components saturate.

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