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Black ATX motherboard with silver heatsinks and a boxed Ryzen 9 9900X processor

MSI

MSI MAG B850 TOMAHAWK MAX WIFI + Ryzen 9 9900X AMD motherboard & CPU combo

SKU CH-1T87-2TKWN

AM5 motherboard and 12-core Ryzen 9 9900X CPU combo with DDR5 8400+ MT/s overclocking, PCIe 5.0 x16, dual Gen5 M.2, 5G LAN and Wi-Fi 7

  • CPU socketAM5
  • ChipsetAMD B850
  • Form factorATX
  • Memory slot count4 × 288pin (DDR5)
  • Supported memoryUp to DDR5 8400+ MT/s (OC)
  • Max supported RAM256 GB
  • 12-core 24-thread Ryzen 9 9900X reaches 5.6 GHz max boost
  • DDR5 memory overclocks to 8400+ MT/s on four 288-pin slots
  • PCIe 5.0 x16 graphics slot plus two CPU-linked M.2 slots at Gen 5 speed
  • 5 Gbps LAN and Wi-Fi 7 with 320 MHz channel deliver 5.8 Gbps peak wireless
  • Realtek ALC4080 audio with Audio Boost 5 isolation provides 7.1-channel output

Combo AM5 12 cœurs 8400 MT/s

The MSI MAG B850 TOMAHAWK MAX WIFI motherboard is paired with an AMD Ryzen 9 9900X processor. The CPU delivers 12 cores and 24 threads built on the Zen 5 architecture with a 5.6 GHz maximum boost clock. The board provides an 80 A SPS VRM design and four DDR5 slots supporting up to 256 GB at 8400+ MT/s when overclocked.

Idéal 12 cœurs DDR5 8400 OC

This combination suits builders who want a 12-core AM5 platform with strong memory overclocking headroom and 5 GbE plus Wi-Fi 7 connectivity. Users needing ECC memory or more than four DIMM slots should consider a different chipset.

VRM 80 A SPS DDR5 8400+ OC

The 80 A SPS power stage rating is the specification that defines the board’s ability to sustain high currents for the 12-core processor during heavy workloads and memory overclocking up to 8400+ MT/s.

How it compares

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

Price $679.99
Pricier than about 73% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameMSI
Model nameMAG B850 TOMAHAWK MAX WIFI+R9 9900X
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

Will my existing DDR5 memory modules work with this board at their rated speeds?

The board supports DDR5 up to 8400+ MT/s when overclocked and runs at 5600 MT/s by default. Four 288-pin slots accept up to 256 GB in dual-channel mode; non-ECC modules are required.

Can I run a PCIe 5.0 graphics card and two PCIe 5.0 M.2 drives simultaneously?

Yes. The CPU provides one PCIe 5.0 x16 slot and two M.2 sockets that each support PCIe 5.0 x4, so a Gen 5 GPU and two Gen 5 SSDs all run at full speed.

What cooling solution do I need for the included Ryzen 9 9900X?

The processor does not ship with a cooler. You will need an AM5-compatible air or liquid cooler rated for a 12-core, 24-thread CPU with a 5.6 GHz maximum boost clock.

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