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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

  • CPU Socket TypeAM5
  • CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
  • ChipsetAMD B850
  • Number of Memory Slots4x288pin (DDR5)
  • Memory StandardSupport DDR5 8200 - 5600 (OC) MT/s / 5600 - 4800 (JEDEC) MT/
  • Maximum Memory Supported256GB
  • 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.

Highlights

  • 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

Specifications

BrandMSI
ModelMAG B850M MORTAR WIFI
CPU Socket TypeAM5
CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Memory StandardSupport DDR5 8200 - 5600 (OC) MT/s / 5600 - 4800 (JEDEC) MT/s
Maximum Memory Supported256GB
Channel SupportedDual Channel
Memory Performance ProfileAMD EXPO
ECC SupportedNon-ECC
Buffer SupportedUn-buffered
Memory FeatureSupports AMD POR Speed and JEDEC Speed
Supports Memory Overclocking and AMD EXPO
Supports Dual-Channel mode
Supports Non-ECC, Un-buffered memory
Supports CUDIMM, Clock Driver bypass mode only
PCI Express 5.0 x16PCI_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)
PCI Express 4.0 x16PCI_E2 Gen PCIe 4.0 supports up to x4 (From Chipset)
Serial ATA (SATA)4 x SATA 6Gb/s
M.2M2_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
SATA RAIDSupports RAID 0, RAID 1 and RAID 10 for SATA storage devices
Supports RAID 0, RAID 1 and RAID 5 for M.2 NVMe storage devices
*RAID 5 configuration is only supported by Ryzen 9000 series processors.
Audio ChipsetRealtek ALC4080
Audio Channels7.1 Channels
Max LAN Speed5Gbps
Wireless LANWi-Fi 802.11 be
BluetoothBluetooth 5.4
Back I/O Ports1 x Clear CMOS Button
1 x 5G LAN
3 x USB 10Gbps Type-A
4 x USB 5Gbps Type-A
2 x Audio Connectors
1 x Flash BIOS Button
1 x HDMI
1 x USB 10Gbps Type-C
1 x USB 20Gbps Type-C
2 x Wi-Fi / Bluetooth
1 x Optical S/PDIF Out
Onboard USB4 x USB 2.0 ports
2 x USB 5Gbps Type A ports
1 x USB 10Gbps Type C ports
Other Connectors1 x CPU Fan
1 x Combo Fan (Pump_Sys Fan)
4 x System Fan
1 x EZ Conn-header (JAF_1)
2 x Front Panel (JFP)
1 x Chassis Intrusion (JCI)
1 x Front Audio (JAUD)
1 x Tuning Controller connector(JDASH)
3 x Addressable V2 RGB LED connector (JARGB_V2)
1 x RGB LED connector(JRGB)
1 x TPM pin header(Support TPM 2.0)
Form FactorMicro ATX
Dimensions (W x L)9.6" x 9.6"
Power Pin1 x Power Connector(ATX_PWR)
2 x Power Connector(CPU_PWR)
1 x Power Connector(PCIE_PWR 8pin)
Windows 11Support for Windows 11 64-bit
Shipping weight1.81 kg
Package size282 × 274 × 71 mm

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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