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ATX motherboard in dark finish with silver heatsinks, CPU installed in AM5 socket

MSI

MSI MAG B850 TOMAHAWK MAX WIFI + Ryzen 7 9800X3D Combo AMD Motherboard

SKU CH-TFFX-461JS

AM5 motherboard and 8-core 16-thread CPU combo with 80A SPS VRM, DDR5 up to 8400+ MT/s, PCIe 5.0 x16, M.2 Gen5, Wi-Fi 7 and 5G LAN

  • CPU socketAM5
  • ChipsetAMD B850
  • Form factorATX
  • Memory slot count4 × 288pin (DDR5)
  • Supported memoryUp to DDR5 8400+ MT/s (OC)
  • Max supported RAM256 GB
  • Ready-to-build combo with Ryzen 7 9800X3D CPU
  • 80 A SPS VRM feeds 8 cores and 16 threads cleanly
  • DDR5 up to 8400 MT/s overclocked for high frame rates
  • PCIe 5.0 x16 plus dual Gen5 M.2 slots for fastest GPUs and SSDs
  • Wi-Fi 7 320 MHz channel plus 5 Gbps LAN for low-latency networking

Combo for AM5 gaming builds

This bundle pairs the MSI MAG B850 TOMAHAWK MAX WIFI motherboard with the AMD Ryzen 7 9800X3D processor. The CPU delivers 8 cores and 16 threads with second-generation 3D V-Cache technology for low-latency gaming. The board uses the AMD B850 chipset and supports Ryzen 7000, 8000 and 9000 series processors.

Tool-less install with slot sharing notes

EZ PCIe Release lets you unlock the graphics card slot with a button press. EZ M.2 Shield Frozr II allows tool-less M.2 SSD and heatsink fitting. PCI_E3 runs at x2 speed when M2_3 is occupied; switching PCI_E3 to x4 in BIOS disables M2_3.

Check CPU cooler clearance and BIOS version

Verify your AM5 cooler mounting hardware is compatible. Ensure the motherboard BIOS supports Ryzen 9000 series before first boot. Confirm your power supply has the required 8-pin and 24-pin connectors for the 80A SPS VRM. Check case clearance for M.2 heatsinks if using all three slots.

How it compares

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

Price $893.99
Pricier than about 83% of the 1,906 comparable items (median $224.49).

New to this? Buying PC parts with Monero — what to check, what it costs to pay, and what is never asked for.

Specifications

Product
Brand nameMSI
Model nameMAG B850 TOMAHAWK MAX WIFI+R7 9800 × 3D
Processor
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
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)
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
Compatibility
Windows 11 support64-bit
More details
Lighting4 x EZ Debug LED
1 x EZ Memory Detection LED

Questions about this item

How can I confirm the 80A SPS VRM is delivering stable power to the Ryzen 7 9800X3D after assembly?

Enter the BIOS hardware monitor and verify the CPU core voltage remains steady under load; the board's 80A SPS VRM is designed for clean delivery to the 8-core 16-thread processor.

Which components are included in the combo box and what must I purchase separately to complete the build?

The box contains the MAG B850 TOMAHAWK MAX WIFI motherboard and the Ryzen 7 9800X3D CPU; you will still need DDR5 memory modules, a CPU cooler, storage drives, a graphics card, a power supply and a case.

Which memory speed tier should I select for the 4 DDR5 slots to match the board's 8400+ MT/s overclocking specification?

Choose a DDR5 kit rated for 8400 MT/s or higher; the board supports up to 8400+ MT/s (OC) with 1DPC 1R population and 256GB maximum capacity across four 288-pin slots.

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