ASUS TUF Gaming B550M-PLUS Micro ATX AM4 motherboard: specs and fit

The ASUS TUF Gaming B550M-PLUS is a Micro ATX motherboard for AMD Ryzen processors that use the AM4 socket. It is built on the B550 chipset and focuses on durability, cooling and networking for a gaming PC. This page explains what the main features mean and what to check before building around it.

Socket and chipset

AM4 is the socket used by a long line of Ryzen desktop processors, and B550 is the chipset that adds PCIe 4.0 support to the platform. The listing doesn't give a processor list, so check ASUS's compatibility page and the BIOS version needed for the Ryzen chip you plan to use. The board takes DDR4 memory, and the listing quotes speeds up to 4400 when overclocked.

Power delivery

ASUS lists 8+2 DrMOS power stages with a ProCool connector, TUF components and Digi+ VRM. The VRM (voltage regulator module) converts power from the supply into the steady, lower voltage the processor needs. More and better power stages typically help a board stay stable under sustained load and with higher-core-count chips. ASUS describes the components as military-grade, which refers to its TUF component standard.

Cooling

The board has VRM heatsinks, a fanless heatsink on the chipset (PCH), an M.2 heatsink and hybrid fan headers. Fan Xpert 2+ is ASUS's utility for controlling fan speeds. A heatsink on the M.2 slot can matter for fast NVMe drives, which typically slow down if they get too hot.

Storage and expansion

The title mentions PCIe 4.0 and dual M.2 slots, so the board can host two NVMe SSDs. It also lists USB 3.2 Gen 2 in Type-A and Type-C. Micro ATX is smaller than a full ATX board, which means fewer expansion slots; confirm that the number of slots matches your cards, such as a graphics card plus any capture or sound card.

Networking and audio

The board has 2.5 Gb Ethernet, plus TUF LANGuard and TurboLAN technology, which ASUS promotes for online gaming. The Realtek S1200A audio codec is listed with a 108 dB signal-to-noise ratio for stereo line out and 103 dB for line in. Higher figures mean less background noise in the analogue signal.

Video output and lighting

The listing mentions HDMI and DisplayPort outputs. These work only with processors that have integrated graphics, so check your chip. Aura Sync links the lighting on compatible parts.

Size and weight

The board measures about 9.6 x 9.6 inches (roughly 24.4 cm square) and weighs 1.8 lb (about 0.8 kg). This is the standard Micro ATX size, so it fits Micro ATX cases and most ATX cases.

Who it suits

It suits people building a compact or mid-size gaming or general-purpose PC on AM4, and those upgrading an older AM4 system who want PCIe 4.0 storage. It's also a sensible base for a Ryzen build where the aim is stability and good cooling.

What to check before you buy

• Processor support: verify your Ryzen model and the BIOS version it needs; an update may be required.
• Memory type: it uses DDR4, not DDR5.
• Case: confirm it accepts Micro ATX boards.
• Display output: onboard video needs a processor with integrated graphics.
• Storage: check which M.2 slots run at PCIe 4.0 speeds and how SATA ports are shared.
• Cooler: check the cooler's mounting compatibility with AM4.

The short version

• Micro ATX board for AMD AM4 Ryzen processors, B550 chipset.
• 8+2 DrMOS power stages, TUF components and Digi+ VRM.
• VRM, chipset and M.2 heatsinks, hybrid fan headers.
• PCIe 4.0, dual M.2, USB 3.2 Gen 2 Type-A and Type-C.
• 2.5 Gb Ethernet and a Realtek S1200A audio codec.

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