Micron Technology, Inc.
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MSI
MSI MAG B850 TOMAHAWK MAX WIFI + Ryzen 9 9950X3D Combo AMD motherboard
AM5 combo with Ryzen 9 9950X3D and B850 board offering DDR5 8400+ MT/s, PCIe 5.0, 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
- Ready-to-build combo with Ryzen 9 9950X3D included
- 80A SPS VRM feeds the 170W CPU cleanly
- DDR5 memory boost to 8400+ MT/s overclock headroom
- PCIe 5.0 x16 plus dual Gen5 M.2 slots
- Wi-Fi 7 320MHz channel plus 5G LAN and 7.1 audio
Combo Foundation
This bundle pairs the MSI MAG B850 TOMAHAWK MAX WIFI motherboard with the AMD Ryzen 9 9950X3D processor on the AM5 socket. It targets builders who want a single validated platform for high-core-count workloads and gaming without mixing parts from different generations. The board's 80A SPS VRM feeds the 170W Zen 5 CPU cleanly.
Build Integration
Four DDR5 slots accept up to 256GB in dual-channel mode with JEDEC speeds from 4800 to 5600 MT/s and overclocked headroom to 8400+ MT/s. The primary PCIe 5.0 x16 slot connects directly to the CPU for graphics, while two CPU-attached M.2 sockets run at PCIe 5.0 x4 for 2280 or 22110 drives. A chipset M.2 runs at PCIe 4.0 x2, four SATA 6Gb/s ports remain for bulk storage, and 5G LAN plus Wi-Fi 7 handle networking. Audio uses the Realtek ALC4080 codec for 7.1-channel output. EZ PCIe Release and tool-less M.2 Shield Frozr II simplify assembly.
Upgrade Context
The combination replaces an older AM4 or early AM5 system when the workload demands 128MB of L3 cache, 16MB L2 cache, and 16 Zen 5 cores at 170W. The jump is worthwhile when memory bandwidth above 5600 MT/s, PCIe 5.0 storage throughput, or 5.8Gbps Wi-Fi 7 throughput become bottlenecks. Integrated Radeon graphics provide a display output without a discrete card during troubleshooting.
Highlights
- Ready-to-build combo with Ryzen 9 9950X3D included
- 80A SPS VRM feeds the 170W CPU cleanly
- DDR5 memory boost to 8400+ MT/s overclock headroom
- PCIe 5.0 x16 plus dual Gen5 M.2 slots
- Wi-Fi 7 320MHz channel plus 5G LAN and 7.1 audio
Specifications
| Brand | MSI |
|---|---|
| Model | MAG B850 TOMAHAWK MAX WIFI+R9 9950X3D |
| CPU Socket Type | AM5 |
| Chipset | AMD B850 |
| Number of Memory Slots | 4x288pin (DDR5) |
| Memory Standard | Up to DDR5 8400+ MT/s (OC) |
| Maximum Memory Supported | 256GB |
| Channel Supported | Dual Channel |
| ECC Supported | Non-ECC |
| Memory Feature | Memory 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 x16 | PCI_E1 Gen PCIe 5.0 supports up to x16 (From CPU) |
| PCI Express x4 | PCI_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 x1 | PCI_E2 Gen PCIe 3.0 supports up to x1 (From Chipset) |
| Serial ATA (SATA) | 4 x SATA 6Gb/s |
| M.2 | M.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 RAID | Supports RAID 0, RAID 1 and RAID 10 for M.2 NVMe storage devices |
| Audio Chipset | Realtek ALC4080 |
| Audio Channels | 7.1 Channels |
| LAN Chipset | Realtek 8126VB |
| Max LAN Speed | 5Gbps |
| Wireless LAN | Wi-Fi 802.11 be |
| Bluetooth | Bluetooth 5.4 |
| Onboard USB | 4 x USB 2.0 ports 4 x USB 5Gbps Type A ports 1 x USB 20Gbps Type C ports |
| Other Connectors | 1 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 Factor | ATX |
| LED Lighting | 4 x EZ Debug LED 1 x EZ Memory Detection LED |
| Dimensions (W x L) | 12.0" x 9.6" |
| Power Pin | 1 x Power Connector(ATX_PWR) 2 x Power Connector(CPU_PWR) 1 x Power Connector(PCIE_PWR 8pin) |
| Windows 11 | Windows 11 64-bit |
Questions about this item
How much power can the 80A SPS VRM deliver to the Ryzen 9 9950X3D before thermal limits appear under sustained load?
The 80A SPS VRM is rated for the 170W CPU, so sustained all-core workloads stay within the motherboard's power delivery design without throttling.
What are the noise and heat characteristics of the board and CPU when running all day at full load?
The 170W Ryzen 9 9950X3D and 80A VRM will produce noticeable heat; adequate case airflow and a capable CPU cooler are required to keep temperatures and fan noise acceptable.
Which DDR5 memory kit must I already own to reach the advertised 8400+ MT/s overclock on this board?
A 1DPC 1R DDR5 kit rated for 8400 MT/s or higher is needed; 2DPC or dual-rank configurations top out at 6400 MT/s per the memory support table.
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