ASUS Prime B550M-A/CSM - Micro ATX - Socket AM4 - AMD B550

ASUS Prime B550M-A/CSM is a micro-ATX motherboard for Socket AM4 systems, built around the AMD B550 chipset and ideal for AMD Ryzen 3000 Series processors.

This ASUS Prime B550M-A/CSM supports Socket AM4 CPUs from AMD and is optimized for Ryzen 3000 Series performance, offering a dependable platform for both productivity and mainstream gaming builds.

The board accommodates up to 128 GB of DDR4 memory across four DIMM slots, supporting a wide range of memory speeds from 2133 MHz up to aggressive overclocked profiles (up to 4600 MHz), and it accepts unbuffered DIMMs for common consumer modules.

Storage options are flexible with M.2 and four SATA III ports, enabling fast NVMe boot drives and multiple high-capacity SATA devices for games, media and work files. Expansion includes one PCIe 4.0 x16 slot for a discrete GPU and two PCIe 3.0 x1 slots for network, audio or capture cards.

Connectivity is practical and business-ready: dual USB 3.2 Gen 1 Type-A and additional USB 3.2 Gen 2 Type-A ports at the rear, USB 2.0 headers, PS/2 legacy support, plus HDMI, DVI-D and VGA display outputs for a range of monitor options. A Gigabit Ethernet port driven by the Realtek RTL8111H handles wired networking.

Onboard audio uses the Realtek ALC887 codec to deliver up to 7.1-channel audio outputs, and fan headers including a CPU fan connector and two chassis fan connectors help maintain thermal control in compact micro-ATX cases.

This board is a good fit for small-form builds such as home office PCs, entry-level gaming rigs, or corporate systems where reliability, legacy I/O and expandability are important. Its black and silver styling blends cleanly into most cases, while the UEFI AMI BIOS with 256 Mbit memory and Clear CMOS jumper makes setup and maintenance straightforward.

Key features:

• Socket AM4 for AMD Ryzen 3000 Series processors
• Supports up to 128 GB DDR4 across 4 DIMM slots (up to 4600 MHz)
• M.2 + 4x SATA III storage support and PCIe 4.0 x16 slot
• Realtek Gigabit Ethernet (RTL8111H) and Realtek ALC887 7.1 audio
• Rear I/O: USB 3.2 Gen2, USB 3.2 Gen1, USB 2.0, HDMI, DVI-D, VGA