MSI MAG B550 TOMAHAWK AM4 Motherboard: features, specs and who it suits

The MSI MAG B550 TOMAHAWK is an ATX motherboard for AMD's AM4 socket. It is built for desktop PC builders who want modern connections such as PCIe 4.0 and fast networking, while staying on DDR4 memory. MSI describes it as hardened with performance specifications aimed at sustained use.

Processor support

The board supports 3rd Gen AMD Ryzen processors and, according to MSI, future Ryzen processors with a BIOS update. The listing names Ryzen 5000 series chips. Because motherboards can ship with older firmware, a BIOS update might be needed before a newer processor will start. Check MSI's CPU support list for the exact BIOS version your processor needs.

Memory

It supports dual-channel DDR4 memory up to 128GB, with speeds listed up to 4866MHz. Those top speeds are typically reached through overclocking profiles, and not every kit will hit them. For stable operation, look for kits on the board's qualified memory list.

PCIe 4.0 and M.2 storage

PCIe 4.0 doubles the bandwidth per lane over PCIe 3.0. On this board it applies to a Lightning Gen 4 M.2 slot, which accepts fast NVMe SSDs, and typically to a graphics card slot when paired with a compatible processor. The M.2 Shield Frozr is a metal cover over the M.2 slot that helps manage drive temperature. The board also has SATA 6Gb/s ports for hard drives and 2.5-inch SSDs.

Networking and USB

Two network ports are fitted: 2.5G LAN and Gigabit LAN. A 2.5G port is useful if your router or switch supports it. Gigabit is the more common standard. USB options include AMD Turbo USB 3.2 Gen 2, and the description mentions USB 3.2 Gen 2x2 Type-C. Video outputs (HDMI and DisplayPort) are listed, though they only work with processors that include integrated graphics.

Audio and lighting

The audio side uses a Realtek ALC1200 or ALC1220P codec, with five rear audio ports plus optical S/PDIF. MSI calls its feature Audio Boost. The Mystic Light system controls RGB lighting, with extendable pin headers, 16.8 million colours and 29 effects.

Cooling and build

MSI lists an aluminum cover with an additional choke thermal pad rated at 7W/mK, and a PCB with 2oz thickened copper. These help move heat away from power components. The board measures about 12.0 x 9.6 inches (30.5 x 24.4 cm) and weighs around 3 lb (1.4 kg).

Who it suits

It suits people building a desktop around a Ryzen processor who want fast storage, 2.5G networking and extra USB and audio features, as well as owners upgrading an older AM4 system.

What to check before you buy

• Processor match: confirm your CPU is on MSI's support list and whether it needs a BIOS update.
• Case size: ATX needs a case that takes full-size boards.
• Memory type: the board takes DDR4 only, not DDR5.
• Graphics: for the video outputs, you need a processor with integrated graphics.
• Cooler fit: check that your CPU cooler is compatible with AM4.
• Storage plans: check how many M.2 and SATA ports you need and any lane sharing noted in the manual.

The short version

• ATX AM4 motherboard (B550 chipset) for Ryzen processors.
• Dual-channel DDR4 up to 128GB.
• PCIe 4.0, Lightning Gen 4 M.2 with Shield Frozr, USB 3.2 Gen 2.
• 2.5G and Gigabit LAN, Mystic Light RGB, Audio Boost.
• Heatsink design with thermal pad and 2oz copper PCB.

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