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Main image of MSI MAG B850 TOMAHAWK MAX WIFI Motherboard& AMD Ryzen 9 9900X3D CPU Combo, AM5 - 80A SPS VRM, DDR5 Memory Boost 8400+ MT/s (OC), PCIe 5.0 x16, M.2 Gen5, Wi-Fi 7, 5G LAN

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MSI MAG B850 TOMAHAWK MAX WIFI Motherboard& AMD Ryzen 9 9900X3D CPU Combo, AM5 - 80A SPS VRM, DDR5 Memory Boost 8400+ MT/s (OC), PCIe 5.0 x16, M.2 Gen5, Wi-Fi 7, 5G LAN

Item #: 9SIVF24M4G8164
Mfr. Part #: MAG B850 TOMAHAWK MAX WIFI+R9 9900X3D
UNSPSC: 43201513

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Motherboard & CPU Combo
Motherboard:MAG B850 TOMAHAWK MAX WIFI
AMD B850
Ryzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series
Up to DDR5 8400+ MT/s (OC)
5G Network Solution: Featuring premium 5G LAN to deliver better network experience.
Wi-Fi7: The latest wireless solution with a new 320MHz channel achieving a maximum transmission speed of 5.8Gbps, which is 2.4 times faster than Wi-Fi 6/6E
Audio Boost 5: Isolated audio with a high quality audio processor for the most immersive gaming experience.
EZ PCIe Release: A simple press of a button to effortlessly lock or unlock the PCIe slot, simplifying the installation and removal of the graphics card.
EZ M.2 Shield Frozr II: The New tool-less design makes installing or removing your M.2 SSD and Shield Frozr much easier
Lightning Gen 5: the latest PCIe 5.0 solution with up to 128GB/s bandwidth for maximum transfer speed.
AMD Ryzen 9 9900X3D CPU
TSMC 4nm FinFET Granite Ridge (Zen 5) 120W
128MB L3 Cache
12MB L2 Cache
AMD Radeon Graphics

Overview

Specs

Reviews

Motherboard & CPU Combo

Motherboard:MAG B850 TOMAHAWK MAX WIFI

AMD B850

Ryzen 7000 Series / Ryzen 8000 Series / Ryzen 9000 Series

Up to DDR5 8400+ MT/s (OC)

5G Network Solution: Featuring premium 5G LAN to deliver better network experience.

Wi-Fi7: The latest wireless solution with a new 320MHz channel achieving a maximum transmission speed of 5.8Gbps, which is 2.4 times faster than Wi-Fi 6/6E

Audio Boost 5: Isolated audio with a high quality audio processor for the most immersive gaming experience.

EZ PCIe Release: A simple press of a button to effortlessly lock or unlock the PCIe slot, simplifying the installation and removal of the graphics card.

EZ M.2 Shield Frozr II: The New tool-less design makes installing or removing your M.2 SSD and Shield Frozr much easier

Lightning Gen 5: the latest PCIe 5.0 solution with up to 128GB/s bandwidth for maximum transfer speed.

AMD Ryzen 9 9900X3D CPU

TSMC 4nm FinFET Granite Ridge (Zen 5) 120W

128MB L3 Cache

12MB L2 Cache

AMD Radeon Graphics

Model
Brand	MSI
Model	MAG B850 TOMAHAWK MAX WIFI+R9 9900X3D

Supported CPU
CPU Socket Type	AM5

Chipsets
Chipset	AMD B850

Memory
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

Expansion Slots
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)

Storage Devices
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

Onboard Audio
Audio Chipset	Realtek ALC4080
Audio Channels	7.1 Channels

Onboard LAN
LAN Chipset	Realtek 8126VB
Max LAN Speed	5Gbps
Wireless LAN	Wi-Fi 802.11 be
Bluetooth	Bluetooth 5.4

Internal I/O Connectors
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)

Physical Spec
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)

Software Feature
Windows 11	Windows 11 64-bit

Additional Information
First Listed on Newegg	August 14, 2026

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MSI MAG B850 TOMAHAWK MAX WIFI Motherboard& AMD Ryzen 9 9900X3D CPU Combo, AM5 - 80A SPS VRM, DDR5 Memory Boost 8400+ MT/s (OC), PCIe 5.0 x16, M.2 Gen5, Wi-Fi 7, 5G LAN

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Item#: 9SIVF24M4G8164

Meet Your Seller

MSI MAG B850 TOMAHAWK MAX WIFI Motherboard& AMD Ryzen 9 9900X3D CPU Combo, AM5 - 80A SPS VRM, DDR5 Memory Boost 8400+ MT/s (OC), PCIe 5.0 x16, M.2 Gen5, Wi-Fi 7, 5G LAN

Learn more about the MSI MAG B850 TOMAHAWK MAX WIFI+R9 9900X3D

Customer Reviews of the MSI MAG B850 TOMAHAWK MAX WIFI+R9 9900X3D

Warranty & Returns

Warranty, Returns, And Additional Information

Warranty

Return Policies

Manufacturer Contact Info