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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 Socket TypeAM5
  • ChipsetAMD X870
  • Number of Memory Slots4x288pin (DDR5)
  • Maximum Memory Supported256GB
  • Channel SupportedDual Channel
  • ECC SupportedNon-ECC

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.

Puntos fuertes

  • 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

Especificaciones

BrandMSI
ModelMAG X870 TOMAHAWK WIFI+R9 9900X3D
CPU Socket TypeAM5
ChipsetAMD X870
Number of Memory Slots4x288pin (DDR5)
Maximum Memory Supported256GB
Channel SupportedDual Channel
ECC SupportedNon-ECC
Buffer SupportedUn-buffered
PCI Express 5.0 x16PCI_E1 slot (From CPU) Supports up to PCIe 5.0 x16
PCI Express x4PCI_E3 slot (From Chipset X870) Supports up to PCIe 4.0 x4
PCI Express x1PCI_E2 slot (From Chipset X870) Supports up to PCIe 3.0 x1
Serial ATA (SATA)4 x SATA 6Gb/s
M.2M2_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 RAIDSupports RAID 0, RAID 1 and RAID 10 for M.2 NVMe storage devices
Audio ChipsetRealtek ALC4080
Audio Channels7.1 Channels
LAN ChipsetRealtek 8126-VB
Max LAN Speed5Gbps
Wireless LANWi-Fi 802.11 be
BluetoothBluetooth 5.4
Back I/O Ports1 x Flash BIOS button
1 x Clear CMOS button
1 x HDMI port
1 x USB 10Gbps Type-A (From CPU)
1 x USB 10Gbps Type-A (From X870 chipset)
1 x USB 10Gbps Type-C (From X870 chipset)
2 x USB 40Gbps Type-C (From ASM4242)
3 x USB 5Gbps Type-A (From GL3523)
4 x USB 2.0 Type-A ports (From GL850)
1 x 5Gbps LAN (RJ45) port
2 x Wi-Fi Antenna connectors
2 x audio jacks
1 x Optical S/PDIF Out connector
Onboard USBAMD X870 Chipset
- 1 x USB 20Gbps Type-C front panel port with Power Delivery Supports up to 27W fast charging
- 2 x USB 5Gbps connectors Supports additional 4 USB 5Gbps ports
- 2 x USB 2.0 connectors Supports additional 4 USB 2.0 ports
Other ConnectorsFan Connectors
- 1x 4-pin CPU fan connector
- 6x 4-pin system fan connectors
- 1x 4-pin water-pump/ system fan connector
- 1x EZ Conn-Header V2 (JAF_2 with 11-Pin)
System Connectors
- 1x Front panel audio connector
- 2x System panel connectors
- 1x Chassis Intrusion connector
- 1x TPM module connector
Jumpers
- 1x Clear CMOS jumper
- 1x OC safe boot BIOS jumper
Form FactorATX
LED Lighting1 x 4-pin RGB LED connector
3 x 3-pin A-RAINBOW V2 (ARGB Gen2) LED connectors
4 x EZ Debug LED
1 x 2-Digit Debug Code LED
1 x EZ Conn-Header V2 (JAF_2 with 11-Pin)
Dimensions (W x L)12.0" x 9.6"
Power Pin1 x 24-pin Power Connector (ATX_PWR)
2 x 8-pin Power Connector (CPU_PWR)
1 x 8-pin Power Connector (PCIE_PWR)
BIOS Feature1x 256 Mb flash
UEFI AMI BIOS
ACPI 6.4, SMBIOS 3.7
Multi-language
SoftwareDrivers
MSI Center
Acrobat
Adobe Creative Cloud
AIDA64 Extreme-MSI Edition
CPU-Z MSI GAMING
MSI App Player (BlueStacks)
Norton 360
FeaturesMSI Center Features
- MSI AI Engine
- Game Highlights
- Frozr AI Cooling
- Hardware Monitoring
- Live Update
- MSI Companion
- System Diagnosis
- Cooling Wizard
- LAN Manager
- Mystic Light
- Ambient Link
- True Color
- User Scenario
- Super Charger +
Thermal Features
- K7 MOSFET thermal pad / K5 Extra choke pad
- Extended Heatsink Design
- Fan headers (CPU + Combo+PUMP + SYSTEM)
- M.2 Shield Frozr
Performance
- Lightning Gen 5 PCI-E Slot / M.2
- Lightning Gen 4 PCI-E Slot / M.2
- Front USB Type-C
- USB with PD
- Supplemental PCIe Power Connector
- Core Boost
- Dual CPU Power
- Memor

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Preguntas sobre este artículo

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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