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Black ATX motherboard with silver heatsinks and CPU in socket

MSI

MSI MAG X870 TOMAHAWK WIFI + Ryzen 9 9900X3D Combo AMD motherboard

SKU CH-H3B4-AC5RK

A motherboard and processor bundle with an AM5 socket, X870 chipset, 80A SPS VRM, DDR5 support to 8400 MT/s, PCIe 5.0 x16, quadruple M.2 slots, USB 40G, 5G LAN and Wi‑Fi 7

  • CPU socketAM5
  • ChipsetAMD X870
  • Form factorATX
  • Memory slot count4 × 288pin (DDR5)
  • Max supported RAM256 GB
  • Memory channelsDual Channel

CPU +R9 9900X3D

  • Pre-installed Ryzen 9 9900X3D with 128MB L3 cache for high-end compute
  • 80A SPS VRM and extended heatsink keep the 120W CPU at full speed
  • DDR5 memory boost to 8400 MT/s across four slots up to 256GB
  • PCIe 5.0 x16 graphics slot plus two CPU-linked M.2 Gen5 drives
  • 5Gbps LAN, Wi-Fi 7 320MHz channel and USB4 40Gbps port for fast I/O

Combo for AM5 builders

This bundle pairs the MAG X870 TOMAHAWK WIFI motherboard with the Ryzen 9 9900X3D processor. It targets enthusiasts assembling a high-performance AM5 platform for gaming and content creation. The board delivers an 80A SPS VRM design, four DDR5 slots supporting up to 256GB, and integrated Wi-Fi 7 plus 5G LAN.

128MB L3 cache for gaming workloads

The Ryzen 9 9900X3D brings 128MB of L3 cache, a 120W TDP, and 12MB of L2 cache on TSMC 4nm Zen 5 architecture. This cache capacity is the decisive factor for latency-sensitive titles and simulation workloads. The CPU also includes integrated Radeon graphics for basic display output or troubleshooting.

Extended heatsink handles sustained 120W loads

MSI's extended PWM heatsink and enhanced circuit layout are engineered to keep the 120W processor running at full speed during prolonged sessions. The 80A SPS VRM provides stable current delivery without throttling. Quadruple M.2 slots with Gen5 support maintain storage throughput under continuous heavy I/O.

How it compares

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

Price $1,033.99
Pricier than about 90% of the 1,906 comparable items (median $224.49).

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Specifications

Product
Brand nameMSI
Model nameMAG X870 TOMAHAWK WIFI+R9 9900 × 3D
Processor
CPU socketAM5
ChipsetAMD X870
Memory
Memory slot count4 × 288pin (DDR5)
Max supported RAM256 GB
Memory channelsDual Channel
ECC supportNon-ECC
BufferingUn-buffered
Storage
SATA ports4 x SATA 6Gb/s
M.2 slotsM2_1 slot (From CPU)
- Supports up to PCIe 5.0 x4
- Supports 2280/110 storage devices
M2_2 slot (From CPU)
- Supports up to PCIe 5.0 x4
- Supports 2260/80 storage devices
M2_3 slot (From Chipset)
- Supports up to PCIe 4.0 x2
- Supports 2260/80 storage devices
M2_4 slot (From Chipset)
- Supports up to PCIe 4.0 x4
- Supports 2260/80 storage devices
* The M2_2 slot will be unavailable when using Ryzen 5 8500G processor.
** PCI_E3 slot will run at x2 speed when installing device in the M2_3 slot
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 8126-VB
Maximum network speed5 Gbit/s
Wi-Fi standardWi-Fi 802.11 be
Bluetooth support5.4
Ports & slots
PCIe 5.0 x16 slotsPCI_E1 slot (From CPU) Supports up to PCIe 5.0 x16
PCIe x4 slotsPCI_E3 slot (From Chipset X870) Supports up to PCIe 4.0 x4
PCIe x1 slotsPCI_E2 slot (From Chipset X870) Supports up to PCIe 3.0 x1
Power
Power connectors1 × 24-pin Power Connector (ATX_PWR)
2 × 8-pin Power Connector (CPU_PWR)
1 × 8-pin Power Connector (PCIE_PWR)
Size & build
Form factorATX
Width and length12.0 in × 9.6 in
More details
BIOS1x 256 Mb flash
UEFI AMI BIOS
ACPI 6.4, SMBIOS 3.7
Multi-language

Other versions of this model

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Questions about this item

Will the included Ryzen 9 9900X3D fit the AM5 socket on this board without a BIOS update?

The board uses the AMD X870 chipset with an AM5 socket, which is the native platform for the Ryzen 9 9900X3D, so the CPU is supported out of the box.

What DDR5 memory speeds can I expect to run stably with the 120W CPU installed?

The board is validated for DDR5 memory boost up to 8400 MT/s when overclocked; actual stability depends on the memory kit and CPU memory controller quality.

How many Gen 5 M.2 drives can I use at full speed simultaneously?

Two M.2 slots connect directly to the CPU and each support PCIe 5.0 x4 for 2280 or 2260 drives, giving you two full-speed Gen 5 NVMe devices.

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