Motherboard MSI B550-A PRO, AMD B550 Chipset, AM4 Socket, ATX

The MSI B550-A PRO motherboard features the AMD B550 chipset and an AM4 socket in an ATX form factor, offering a platform for building desktop systems focused on reliability and compatibility. It supports up to four DDR4 DIMM memory slots and provides multiple storage options through six SATA connectors and M.2 interfaces. This unit is a used, refurbished board and is supplied with the back panel only.

Advantages

The combination of the AMD B550 chipset and AM4 socket ensures compatibility with a range of Ryzen processors, allowing flexible CPU upgrades within the AM4 ecosystem. The ATX layout provides standard expansion capabilities for additional cards and cooling solutions. With four DDR4 DIMM slots, the board supports multi-module memory configurations, while six SATA connectors and M.2 interfaces allow installation of several drives for boot, cache, and mass storage. As a refurbished product, it offers reduced cost compared with new units while having been tested for basic functionality; the package includes the back panel.

Suitable for (tasks / use cases)

• Building or upgrading a desktop PC for general productivity tasks
• Entry to mid-level gaming builds where AM4 CPU support and multiple storage devices are needed
• Home or small office workstations that require standard ATX expansion and multiple drives
• Repair or replacement of an existing ATX motherboard with AMD B550 chipset

Key specifications

• Brand: MSI
• Model: B550-A PRO (MPN: B550-A PROSO)
• Chipset: AMD B550
• CPU socket: AM4
• Form factor: ATX
• Memory: Up to 4 x DDR4 DIMM slots
• Storage interfaces: 6 x SATA connectors; M.2 interfaces
• Condition: Used, refurbished; back panel included
• EAN: 2000001383698

How to use

Install the motherboard into a compatible ATX case using the standard standoffs and mounting screws. Fit an AM4-compatible CPU and apply thermal interface material before attaching a supported cooler. Populate DDR4 memory modules into the DIMM slots according to the motherboard manual for optimal channel configuration. Connect storage devices to the six SATA ports or to available M.2 slots, and attach power from a compatible PSU to the 24-pin ATX and CPU power connectors. Install any required graphics or expansion cards into PCIe slots and connect front-panel headers, USB, and audio as needed. After assembling hardware, enter the BIOS/UEFI to verify device recognition and configure boot order and memory settings.

Usage recommendations

Ensure compatibility of the chosen AM4 CPU and DDR4 memory modules with the MSI B550-A PRO by consulting official CPU and memory support lists. Use properly rated power supplies and adequate cooling. Because this is a refurbished unit supplied with only the back panel, confirm you have or source any additional cables, screws, or accessories needed for installation.