The MSI B550-A PRO is an AM4 socket motherboard equipped with the AMD B550 chipset for 3rd generation AMD Ryzen processors. The motherboard also supports next-generation AMD Ryzen processors with a BIOS update. The B550 chipset’s PCIe 4.0 support provides the necessary bandwidth for high-speed SSDs and next-generation graphics cards!

MSI PRO series motherboards offer comprehensive features at an affordable price and are suitable for both work and gaming. The motherboard’s dedicated water pump power connector provides sufficient power for both AIO and custom water cooling systems, and the CPU power delivery is designed for even the most powerful AMD Ryzen processors. However, for overclocking the highest-end models, we recommend MSI MPG and MAG series motherboards.

Features:

• Chipset: AMD B550
• Processor socket: AM4
• Processor support: 3rd generation Ryzen series processors
• Motherboard size: ATX
• Memory slots (pcs): 4
• Memory type: DDR4
• Maximum memory (GB): 128
• Network interfaces: Realtek 8111H Gigabit LAN
• Sound card: Realtek ALC892
• CrossFireX support: Yes
• SLI support: No

Expansion slots

• 1x PCIe 4.0/3.0 x16 slot
• 1x PCIe 3.0 x16 slot, supports x4 speed
• 2x PCIe 3.0 x1 slots

Storage connections

• 6x SATA 6Gb/s ports
• 2x M.2 slots (Key M)
  • M2_1 slot (from AMD Processor)
    • Supports PCIe 4.0/3.0 x4
    • Supports SATA 6Gb/s
    • Supports 2242/2260/2280/22110 storage devices
  • M2_2 slot (from AMD B550 chipset)
    • Supports PCIe 3.0 x4
    • Supports 2242/2260/2280 storage devices

Rear panel connectors

• Keyboard / Mouse
• DisplayPort
• LAN
• HD Audio Connectors
• Flash BIOS Button
• 4 x USB 2.0
• HDMI
• 2 x USB 3.2 Gen 1 5Gbps Type-A
• USB 3.2 Gen 2 10Gbps Type-A+C

Internal connectors