MSI B550-A PRO AM4 ATX Motherboard — B550, 2× M.2, USB‑C

Description

Overview

The MSI B550-A PRO is an ATX motherboard built around AMD’s B550 chipset for Socket AM4 processors. It offers a practical mix of modern connectivity — PCIe 4.0 from the CPU, dual M.2 slots, USB‑C Gen2 on the rear I/O and support for up to 128GB of DDR4 memory — aimed at professional and mainstream desktop builds.

Key features

• B550 chipset with AM4 socket supporting 3rd‑gen Ryzen and Ryzen 5000 desktop processors (may require a BIOS update for some CPUs; check MSI CPU support list).
• One PCIe 4.0 x4 M.2 (from CPU) and one PCIe 3.0 x4 M.2 (from chipset) with M.2 Shield FROZR.
• 4× DIMM DDR4 (dual channel) up to 128GB, XMP/A‑XMP OC support for higher memory clocks.
• 6× SATA 6Gb/s ports and RAID 0/1/10 support for SATA; RAID 0/1 for NVMe M.2.
• Rear I/O with USB 3.2 Gen2 Type‑C + Type‑A, additional USB 3.2 Gen1 and USB 2.0 ports, HDMI and DisplayPort (requires a CPU with integrated graphics).

Who it suits

• Users building a cost‑efficient AM4 desktop that needs PCIe 4.0 storage performance for the primary M.2 slot.
• Workstation or mainstream gaming systems where stable connectivity (Gigabit LAN, plentiful SATA) and expandability (2× M.2, multiple PCIe slots) are desirable.

Notes

• Onboard display outputs only work with CPUs that include integrated graphics; discrete GPU recommended for most gaming builds.
• The board does not include onboard Wi‑Fi or Bluetooth; add‑on cards or modules are needed for wireless connectivity.
• Some Ryzen 5000 series CPUs may require a BIOS update before use — verify the board BIOS version or use a vendor that provides a compatible BIOS if needed.