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ATX motherboard, matte black with silver heatsinks, AM5 socket, four DDR5 slots, multiple M.2 shields, rear I/O with HDMI, LAN, USB-C

MSI

MSI MAG B850 TOMAHAWK MAX WIFI II AMD motherboard

SKU CH-75WB-H2FF5 MPN MAG B850 TOMAHAWK MAX WIFI II

ATX AM5 board with 14+2+1 phase 80A VRM, DDR5 up to 8400 MT/s, dual Gen5 M.2, PCIe 5.0 x16, Wi-Fi 7 and 5Gbps LAN

  • CPU Socket TypeAM5
  • CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
  • ChipsetAMD B850
  • Number of Memory Slots4x288pin (DDR5)
  • Memory StandardUp to DDR5-8200+ MT/s (OC)
  • Channel SupportedDual Channel

Option MAG B850 TOMAHAWK MAX WIFI II

Struck-through versions exist but are not stocked here.

  • Stable high-end CPU power with 14+2+1 phase 80A Smart Power Stage VRM
  • DDR5 speeds up to 8400+ MT/s across four slots for 256GB capacity
  • Two M.2 Gen5 x4 128Gbps slots plus two Gen4 slots with EZ M.2 Shield Frozr II heatsinks
  • PCIe 5.0 x16 slot with supplemental power connector for next-gen GPU and AI workloads
  • Wi-Fi 7, Bluetooth 5.4 and 5Gbps LAN for ultra-fast wired and wireless connectivity

AM5 motherboard for Ryzen 9000, 8000, 7000 series

The MSI MAG B850 TOMAHAWK MAX WIFI II is an ATX board built on the AMD B850 chipset with an AM5 socket. It supports AMD Ryzen 9000, 8000 and 7000 series processors, including the Ryzen 7 9800X3D and 9850X3D. A 14+2+1 phase Duet Rail VRM with 80A Smart Power Stages and dual EPS connectors delivers stable power for high-end CPUs.

Check CPU cooler clearance.

Verify that your CPU cooler fits the AM5 socket mounting pattern and does not block the four DDR5 DIMM slots. Ensure your power supply provides two EPS (8-pin) connectors for the VRM. Confirm your DDR5 memory kit is rated for the speeds you intend to run, up to 8400+ MT/s (OC), and that you populate slots correctly for dual-channel operation.

VRM heatsinks, M.2 shields

The VRM heatsinks and EZ M.2 Shield Frozr II heatsinks on all four M.2 slots dissipate heat from the 80A power stages and Gen5 NVMe drives. Multiple fan headers allow curve tuning for quiet airflow. The supplemental PCIe power connector on the board helps deliver clean power to the PCIe 5.0 x16 slot under heavy GPU or AI workloads.

Highlights

  • Stable high-end CPU power with 14+2+1 phase 80A Smart Power Stage VRM
  • DDR5 speeds up to 8400+ MT/s across four slots for 256GB capacity
  • Two M.2 Gen5 x4 128Gbps slots plus two Gen4 slots with EZ M.2 Shield Frozr II heatsinks
  • PCIe 5.0 x16 slot with supplemental power connector for next-gen GPU and AI workloads
  • Wi-Fi 7, Bluetooth 5.4 and 5Gbps LAN for ultra-fast wired and wireless connectivity

Specifications

BrandMSI
ModelMAG B850 TOMAHAWK MAX WIFI II
CPU Socket TypeAM5
CPU TypeRyzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Memory StandardUp to DDR5-8200+ MT/s (OC)
Channel SupportedDual Channel
PCI Express 5.0 x161 x PCI Express 5.0 x16
PCI Express x41 x PCI Express 4.0 x4
PCI Express x11 x PCI Express 3.0 x1
M.22 x M.2 Gen5 x4 128Gbps slots
1 x M.2 Gen4 x4 64Gbps slot
1 x M.2 Gen4 x2 32Gbps slot
Audio Channels8-Channel (7.1) HD Audio with Audio Boost
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 HDMI / 1 x LAN (RJ45) / 1 x Optical S/PDIF Out / 1 x USB 3.2 Gen 2 Type-A / 1 x USB 3.2 Gen 2 Type-C / 2 x Antenna Bracket / 2 x Audio Jacks / 2 x USB 3.2 Gen 2 Type-A / 2 x USB 3.2 Gen 2 Type-C / 4 x USB 2.0/1.1
BIOS Feature64MB BIOS
Shipping weight2.04 kg
Package size343 × 268 × 71 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

What accessories are included in the box and is a Wi‑Fi antenna provided?

The board ships with two antenna brackets for the Wi‑Fi 7 module and a standard accessory pack containing cables, manuals and the I/O shield.

Which DDR5 speed should I target for the 8400+ MT/s OC rating?

Buy a DDR5 kit rated at 8400 MT/s or higher with EXPO support; the four 288‑pin slots run dual‑channel up to 256GB and the OC Engine handles the BCLK tuning.

What does the 128Gbps M.2 Gen5 rating mean for real SSD performance?

Each of the two top Gen5 x4 slots delivers up to 128Gbps bandwidth, so a PCIe 5.0 NVMe drive can hit its sequential read and write peaks without bottleneck.

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