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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

  • CPU Socket TypeAM5
  • CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
  • ChipsetAMD B850
  • Number of Memory Slots4x288pin (DDR5)
  • Memory StandardUp to DDR5 8400+ MT/s (OC)
  • Maximum Memory Supported256GB

Option MAG B850 TOMAHAWK MAX WIFI

Struck-through versions exist but are not stocked here.

  • 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.

Highlights

  • 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

Specifications

BrandMSI
ModelMAG B850 TOMAHAWK MAX WIFI
CPU Socket TypeAM5
CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Memory StandardUp to DDR5 8400+ MT/s (OC)
Maximum Memory Supported256GB
Channel SupportedDual Channel
Memory Performance ProfileAMD EXPO
ECC SupportedNon-ECC
Memory FeatureMemory Support DDR5 8400 - 5600 (OC) MT/s / 5600 - 4800 (JEDEC) MT/s
Ryzen 9000 Series Processors max. overclocking frequency:
- 1DPC 1R Max speed up to 8400+ MT/s
- 1DPC 2R Max speed up to 6400+ MT/s
- 2DPC 1R Max speed up to 6400+ MT/s
- 2DPC 2R Max speed up to 4800+ MT/s
Supports 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 Express x4PCI_E3 Gen PCIe 4.0 supports up to x4 (From Chipset)
*PCI_E3 slot will run at x2 speed when installing device in the M2_3 slot. You can switch PCI_E3 slot to x4 in the BIOS, but this will disable the M2_3 slot
PCI Express x1PCI_E2 Gen PCIe 3.0 supports up to x1 (From Chipset)
Serial ATA (SATA)4 x SATA 6Gb/s
M.2M.2_1 Source (From CPU) supports up to PCIe 5.0 x4 , supports 22110/2280 devices
M.2_2 Source (From CPU) supports up to PCIe 5.0 x4 , supports 2280/2260 devices
M.2_3 Source (From Chipset) supports up to PCIe 4.0 x2 , supports 2280/2260 devices
M.2_4 Source (From Chipset) supports up to PCIe 4.0 x4 , supports 2280/2260 devices
*PCI_E3 slot will run at x2 speed when installing device in the M2_3 slot. You can switch PCI_E3 slot to x4 in the BIOS, but this will disable the M2_3 slot.
** Please refer to the manual for M.2 SSD heatsink restrictions
SATA RAIDSupports RAID 0, RAID 1 and RAID 10 for M.2 NVMe storage devices
Audio ChipsetRealtek ALC4080
Audio Channels7.1 Channels
LAN ChipsetRealtek 8126VB
Max LAN Speed5Gbps
Wireless LANWi-Fi 802.11 be
BluetoothBluetooth 5.4
Back I/O 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 USB4 x USB 2.0 ports
4 x USB 5Gbps Type A ports
1 x USB 20Gbps Type C ports
Other Connectors1 x CPU Fan
1 x Combo Fan (Pump_Sys Fan)
6 x System Fan
1 x EZ Conn-header (JAF_2)
2 x Front Panel (JFP)
1 x Chassis Intrusion (JCI)
1 x Front Audio (JAUD)
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 FactorATX
LED Lighting4 x EZ Debug LED
1 x EZ Memory Detection LED
Dimensions (W x L)12.0" x 9.6"
Power Pin1 x Power Connector(ATX_PWR)
2 x Power Connector(CPU_PWR)
1 x Power Connector(PCIE_PWR 8pin)
Windows 11Windows 11 64-bit
Shipping weight2.13 kg
Package size343 × 273 × 72 mm

Other versions of this model

5 more in the same range

Same family, different memory, cooler or clock — compare before you commit.

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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