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Rectangular ATX board, dark finish, silver heatsinks, four memory slots, one long PCIe slot, three M.2 covers

MSI

MSI MAG B850 TOMAHAWK MAX WIFI AMD motherboard

SKU CH-3F79-HKBE2 MPN MAG B850 TOMAHAWK MAX WIFI

ATX board for AM5 Ryzen 7000, 8000 and 9000 CPUs with 80 A VRM, DDR5 up to 8400 MT/s, PCIe 5.0 x16, dual Gen5 M.2 slots, Wi-Fi 7, 5G LAN and 7.1 audio

  • ProcessorRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
  • ChipsetAMD B850
  • Form factorATX
  • CPU socketAM5
  • Memory slot count4 × 288pin (DDR5)
  • Supported memoryUp to DDR5 8400+ MT/s (OC)

Model MAG B850 TOMAHAWK MAX WIFI

  • Supports Ryzen 7000, 8000 and 9000 series CPUs on AM5 socket
  • DDR5 memory overclocking up to 8400+ MT/s with AMD EXPO profiles
  • PCIe 5.0 x16 graphics slot plus two CPU-linked M.2 slots at PCIe 5.0 x4
  • Wi-Fi 7 with 320 MHz channel reaching 5.8 Gbps, 2.4 times faster than Wi-Fi 6
  • 5G LAN and Realtek ALC4080 7.1-channel audio for low-latency networking and immersive sound

AMD B850 motherboard for Ryzen 7000, 8000 and 9000

This ATX board uses the AMD B850 chipset and AM5 socket to support Ryzen 7000, 8000 and 9000 series processors. It provides an 80A SPS VRM design and four DDR5 slots with a maximum capacity of 256GB. The board targets builders who want PCIe 5.0 graphics and storage plus Wi-Fi 7 and 5G LAN connectivity.

EZ PCIe Release and tool-less M.2 Shield Frozr II

A press button unlocks the PCIe 5.0 x16 slot so graphics cards can be swapped without fumbling with a latch. M.2_1 and M.2_2 use tool-less shields that snap into place for 22110, 2280 and 2260 drives. Installing a device in M2_3 forces PCI_E3 to run at x2 speed unless the slot is switched to x4 in BIOS, which then disables M2_3.

DDR5 up to 8400 MT/s and PCIe 5.0 storage headroom

With Ryzen 9000 the board reaches 8400+ MT/s in 1DPC 1R configuration, 6400+ MT/s in 1DPC 2R and 5600 MT/s JEDEC baseline. M.2_1 and M.2_2 connect directly to the CPU at PCIe 5.0 x4 for the fastest NVMe drives. M.2_3 runs at PCIe 4.0 x2 from the chipset. Four SATA 6Gb/s ports and RAID 0, 1, 10 for M.2 NVMe complete the storage options.

How it compares

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

Price $168.99
Cheaper than about 58% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameMSI
Model nameMAG B850 TOMAHAWK MAX WIFI
Processor
ProcessorRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
CPU socketAM5
ChipsetAMD B850
Memory
Memory slot count4 × 288pin (DDR5)
Supported memoryUp to DDR5 8400+ MT/s (OC)
Max supported RAM256 GB
Memory channelsDual Channel
Memory profilesAMD EXPO
ECC supportNon-ECC
Storage
SATA ports4 x SATA 6Gb/s
SATA and RAID supportSupports RAID 0, RAID 1 and RAID 10 for M.2 NVMe storage devices
Audio & video
Audio chipRealtek ALC4080
Sound channels7.1 Channels
Connectivity
Ethernet controllerRealtek 8126VB
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)
PCIe x1 slotsPCI_E2 Gen PCIe 3.0 supports up to x1 (From Chipset)
Rear panel ports1 x Clear CMOS Button / 1 x Flash BIOS Button / 1 x LAN (RJ45) / 2 x Antenna Bracket / 2 x Audio Jacks / 2 x USB 3.2 Gen 2 Type-A / 3 x USB 3.2 Gen 2 Type-C / 4 x USB 2.0/1.1
Onboard USB headers4 x USB 2.0 ports
4 x USB 5 Gbit/s Type A ports
1 x USB 20 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 factorATX
Width and length12.0 in × 9.6 in
Shipping weight2.13 kg
Package size343 × 273 × 72 mm
Compatibility
Windows 11 support64-bit
More details
Lighting4 x EZ Debug LED
1 x EZ Memory Detection LED

Other versions of this model

5 more in the same range

Questions about this item

How do I confirm the board is running DDR5 at 8400 MT/s after I enable EXPO in BIOS?

Enter the BIOS, load the EXPO profile for your kit, save and reboot, then open the memory tab or a tool such as CPU-Z to verify the DRAM frequency reads 8400 MT/s.

Which cables or modules are not included and must be purchased separately for a first build?

The box contains the motherboard, I/O shield, Wi-Fi 7 antennas, SATA cables and M.2 screws; you still need a Ryzen 7000/8000/9000 CPU, DDR5 UDIMM modules, a graphics card, storage drives and an ATX power supply.

Which M.2 slot should I use for a PCIe 5.0 NVMe drive to get the full x4 Gen 5 speed?

Use M.2_1 or M.2_2 — both are wired to the CPU and support PCIe 5.0 x4; M.2_3 runs from the chipset at PCIe 4.0 x2.

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