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Micro-ATX board with dark grey heatsinks and silver AM5 socket

MSI

MSI MAG B850M MORTAR MAX WIFI AMD motherboard

SKU CH-XPZ4-ZHV83

AM5 motherboard with 14+2+1 power phases, DDR5 8400 MT/s support, PCIe 5.0 slots, 5G Ethernet and Wi-Fi 7

  • CPU socketAM5
  • ChipsetAMD B850
  • Supports Ryzen 9000, 8000 and 7000 series processors via AM5 socket
  • DDR5 dual-channel memory overclocked to 8400 MT/s for responsive multitasking
  • 14+2+1 phase power delivery with dual 8-pin CPU connectors for stable loads
  • PCIe 5.0 slots and Gen 5 x4 M.2 give 20 Gb/s USB Type-C speed
  • 5G Ethernet plus Wi-Fi 7 provide low-latency wired and wireless networking

AM5 B850 motherboard for Ryzen 9000 8000 7000

The MSI MAG B850M MORTAR MAX WIFI is an AM5 micro-ATX board built around the AMD B850 chipset. It supports Ryzen 9000 8000 and 7000 series desktop processors with a 14 plus 2 plus 1 phase power design and dual eight pin CPU connectors. DDR5 memory runs dual channel at 8400 MT/s when overclocked. Onboard networking includes 5G Ethernet and Wi-Fi 7.

Tool-free M.2 and GPU quick release

Installation uses second generation tool-free M.2 Frost Armor and quick release latches for both M.2 drives and the graphics card. The plug and play Wi-Fi antenna attaches without screws. Common issues include forgetting to seat the dual eight pin power cables fully and leaving the M.2 shield screws loose which reduces thermal contact.

Check CPU cooler clearance and DDR5 kits

Verify that your CPU cooler fits the micro-ATX layout around the extended heatsinks and power delivery area. Confirm your memory kit is DDR5 rated for the speeds you want because the board does not support older DDR generations. Ensure the case has a rear USB 20G Type-C header if you plan to use the front panel port.

How it compares

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

Price $321.99
Pricier than about 58% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameMSI
Model nameMAG B850M MORTAR MAX WIFI
Processor
CPU socketAM5
ChipsetAMD B850

Questions about this item

How can I verify the 14+2+1-phase power delivery is active after assembly?

Enter the BIOS and confirm the CPU VRM phase count reads 14+2+1; monitor VRM temperatures under load — they should stay low thanks to the 7W/mK MOSFET pads and extended heatsinks.

What ships with the board and what must I source separately?

The board includes the 2nd-generation tool-free M.2 Frost Armor, M.2 quick-release, GPU quick-release latch, and a plug-and-play Wi-Fi 7 antenna; you must buy a Ryzen 7000/8000/9000 CPU, DDR5 memory, storage, and PSU separately.

Which supported CPU should I choose — 9700X, 9800X3D, or 9850X3D?

Pick the 9700X for efficient 8-core gaming, the 9800X3D for maximum 3D V-Cache gaming performance, or the 9850X3D for the highest boost clocks with 3D V-Cache; all fit the AM5 socket and 14+2+1-phase VRM.

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