MSI PRO B550M-B AM4 DDR4 Micro-ATX Motherboard
The MSI PRO B550M-B is a Micro-ATX motherboard on the AMD B550 chipset for the AM4 socket, designed as a streamlined DDR4 foundation for business and home PCs. It supports AMD Ryzen 5000 Series, 5000 G-Series, 4000 G-Series, 3000 Series and 3000 G-Series desktop processors, and its dual M.2 layout gives a compact system generous fast-storage options without a larger board.
Key Specifications
- Socket AM4 with AMD B550 chipset in a Micro-ATX form factor
- 2 DDR4 memory slots supporting up to 64GB, with DDR4 speeds up to 4600 MHz by A-XMP OC mode
- 1 PCIe 4.0 x16 slot for a graphics card
- 2 M.2 slots: one PCIe 4.0 x4 and SATA mode slot from the CPU and one PCIe 3.0 x4 slot from the chipset, plus 4 SATA 6Gbps ports
- RAID 0, RAID 1, RAID 5 and RAID 10 for SATA storage, and RAID 0, RAID 1 and RAID 10 for M.2 NVMe storage
- Realtek RTL8111H 1Gbps LAN and Realtek ALC897 codec with 7.1-channel high definition audio
- HDMI 2.1 and DisplayPort 1.2 outputs supporting 4K at 60Hz, available only on processors featuring integrated graphics
- Rear USB: 4 USB 5Gbps Type-A ports and 2 USB 2.0 ports; front headers add 2 USB 5Gbps Type-A ports, 1 USB 5Gbps Type-C port and 4 USB 2.0 ports
- 4 EZ Debug LEDs, 3 addressable V2 RGB LED connectors and 1 RGB LED connector
Dual M.2 Storage Layout
Two M.2 slots set this board apart from simpler B550M designs: the CPU-connected slot runs at PCIe 4.0 x4 and also accepts SATA mode drives, while the chipset-connected slot runs at PCIe 3.0 x4, so a system can carry a fast boot SSD and a second NVMe drive without giving up SATA capacity. The front USB Type-C header keeps modern cases fully connected, and EZ Debug LEDs simplify troubleshooting by pointing to the component holding up a boot.
- Install a PCIe 4.0 NVMe SSD in the primary M.2 slot for the operating system and applications.
- Add a second NVMe SSD in the chipset M.2 slot for games or project files.
- Use up to 64GB of DDR4 and the PCIe 4.0 x16 slot for a graphics card to complete a balanced office or light gaming PC.
