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Black ATX motherboard with silver heatsinks and a boxed Ryzen 9 9900X3D CPU

MSI

MSI MAG B850 TOMAHAWK MAX WIFI AMD motherboard with Ryzen 9 9900X3D CPU

SKU CH-C6FM-88M23

AM5 combo pairs a B850 board with a 12-core Ryzen 9 9900X3D, DDR5 up to 8400 MT/s, PCIe 5.0 x16, 5G LAN and Wi-Fi 7

  • CPU Socket TypeAM5
  • ChipsetAMD B850
  • Number of Memory Slots4x288pin (DDR5)
  • Memory StandardUp to DDR5 8400+ MT/s (OC)
  • Maximum Memory Supported256GB
  • Channel SupportedDual Channel
  • Stable power delivery for heavy workloads with 80A SPS VRM
  • DDR5 memory overclocked to 8400+ MT/s for responsive multitasking
  • PCIe 5.0 x16 slot provides up to 128GB/s bandwidth for graphics and storage
  • Wi-Fi 7 with 320MHz channel reaches 5.8Gbps maximum wireless speed
  • 5Gbps LAN and Realtek ALC4080 7.1 audio for fast wired networking and immersive sound

AM5 DDR5 motherboard with Ryzen 9 9900X3D

This combo pairs an MSI MAG B850 TOMAHAWK MAX WIFI board with an AMD Ryzen 9 9900X3D processor on the AM5 socket. The CPU delivers 12 cores based on the Zen 5 architecture and a total L3 cache of 128MB. The board supports DDR5 memory up to 8400+ MT/s when overclocked and provides a 16+2+1 phase 80A SPS VRM design. Integrated Radeon graphics handle basic display output.

Builders targeting high-refresh gaming

The platform suits enthusiasts who want PCIe 5.0 x16 graphics bandwidth and two CPU-attached M.2 slots running at Gen 5 speeds. A 5 Gbps LAN port and Wi-Fi 7 with a 320 MHz channel provide high-throughput networking. Users needing more than four SATA 6 Gb/s ports or a chipset with additional CPU-linked PCIe lanes should evaluate other options.

Tool-less installation with slot-sharing caveats

EZ PCIe Release and EZ M.2 Shield Frozr II allow graphics card and SSD mounting without tools. The primary PCIe 5.0 x16 slot and two M.2 slots connect directly to the CPU for straightforward routing. Builders must note that populating the third M.2 slot reduces the chipset-linked PCIe x4 slot to x2 speed unless the M.2 slot is disabled in BIOS.

Highlights

  • Stable power delivery for heavy workloads with 80A SPS VRM
  • DDR5 memory overclocked to 8400+ MT/s for responsive multitasking
  • PCIe 5.0 x16 slot provides up to 128GB/s bandwidth for graphics and storage
  • Wi-Fi 7 with 320MHz channel reaches 5.8Gbps maximum wireless speed
  • 5Gbps LAN and Realtek ALC4080 7.1 audio for fast wired networking and immersive sound

Specifications

BrandMSI
ModelMAG B850 TOMAHAWK MAX WIFI+R9 9900X3D
CPU Socket TypeAM5
ChipsetAMD B850
Number of Memory Slots4x288pin (DDR5)
Memory StandardUp to DDR5 8400+ MT/s (OC)
Maximum Memory Supported256GB
Channel SupportedDual Channel
ECC SupportedNon-ECC
Memory FeatureMemory Support DDR5 8400 - 5600 (OC) MT/s / 5600 - 4800 (JEDEC) MT/s
Ryzen 9000 Series Processors max. overclocking frequency:
- 1DPC 1R Max speed up to 8400+ MT/s
- 1DPC 2R Max speed up to 6400+ MT/s
- 2DPC 1R Max speed up to 6400+ MT/s
- 2DPC 2R Max speed up to 4800+ MT/s
Supports AMD POR Speed and JEDEC Speed
Supports Memory Overclocking and AMD EXPO
Supports Dual-Channel mode
Supports Non-ECC, Un-buffered memory
Supports CUDIMM, Clock Driver bypass mode only
PCI Express 5.0 x16PCI_E1 Gen PCIe 5.0 supports up to x16 (From CPU)
PCI Express x4PCI_E3 Gen PCIe 4.0 supports up to x4 (From Chipset)
*PCI_E3 slot will run at x2 speed when installing device in the M2_3 slot. You can switch PCI_E3 slot to x4 in the BIOS, but this will disable the M2_3 slot
PCI Express x1PCI_E2 Gen PCIe 3.0 supports up to x1 (From Chipset)
Serial ATA (SATA)4 x SATA 6Gb/s
M.2M.2_1 Source (From CPU) supports up to PCIe 5.0 x4 , supports 22110/2280 devices
M.2_2 Source (From CPU) supports up to PCIe 5.0 x4 , supports 2280/2260 devices
M.2_3 Source (From Chipset) supports up to PCIe 4.0 x2 , supports 2280/2260 devices
M.2_4 Source (From Chipset) supports up to PCIe 4.0 x4 , supports 2280/2260 devices
*PCI_E3 slot will run at x2 speed when installing device in the M2_3 slot. You can switch PCI_E3 slot to x4 in the BIOS, but this will disable the M2_3 slot.
** Please refer to the manual for M.2 SSD heatsink restrictions
SATA RAIDSupports RAID 0, RAID 1 and RAID 10 for M.2 NVMe storage devices
Audio ChipsetRealtek ALC4080
Audio Channels7.1 Channels
LAN ChipsetRealtek 8126VB
Max LAN Speed5Gbps
Wireless LANWi-Fi 802.11 be
BluetoothBluetooth 5.4
Onboard USB4 x USB 2.0 ports
4 x USB 5Gbps Type A ports
1 x USB 20Gbps Type C ports
Other Connectors1 x CPU Fan
1 x Combo Fan (Pump_Sys Fan)
6 x System Fan
1 x EZ Conn-header (JAF_2)
2 x Front Panel (JFP)
1 x Chassis Intrusion (JCI)
1 x Front Audio (JAUD)
3 x Addressable V2 RGB LED connector (JARGB_V2)
1 x RGB LED connector(JRGB)
1 x TPM pin header(Support TPM 2.0)
Form FactorATX
LED Lighting4 x EZ Debug LED
1 x EZ Memory Detection LED
Dimensions (W x L)12.0" x 9.6"
Power Pin1 x Power Connector(ATX_PWR)
2 x Power Connector(CPU_PWR)
1 x Power Connector(PCIE_PWR 8pin)
Windows 11Windows 11 64-bit

Questions about this item

Will this motherboard and CPU combination fit in a standard ATX case?

The board uses the ATX form factor so it fits any case that accepts ATX motherboards; the CPU is a standard AM5 package and installs directly into the socket.

What memory kits can I run at the advertised 8400 MT/s speed?

With a Ryzen 9000 series processor you can reach 8400+ MT/s using a single-rank, one-DIMM-per-channel kit; two-rank or four-module configs top out lower.

How many high-speed M.2 drives can I install without losing PCIe lanes?

Two CPU-attached M.2 slots run at PCIe 5.0 x4 each; the third slot runs at PCIe 4.0 x2 and shares bandwidth with the PCIe x4 expansion slot.

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