
Micro-ATX AMD B550 motherboard for AM4 Ryzen with PCIe 4.0 graphics and M.2, two DDR4 slots, HDMI, DisplayPort and Gigabit LAN.
The MSI PRO B550M-B is a compact micro-ATX motherboard built on the AMD B550 chipset for AM4 Ryzen processors, standing out with PCIe 4.0 on both the graphics slot and the main M.2 slot. It suits budget Ryzen gaming and office builds that want Gen4 storage without paying for a larger board.
A Gen4 ready B550 micro-ATX board for compact Ryzen builds.
| Spec | Value |
|---|---|
| Type | Micro-ATX motherboard |
| Socket | AM4 |
| Chipset | AMD B550 |
| CPU support | AMD Ryzen 5000, 5000 G, 4000 G, 3000, 3000 G Series |
| Memory | 2x DDR4, up to 64GB, 4600+ MT/s (OC) |
| Graphics slot | 1x PCIe 4.0 x16 |
| M.2 | 1x PCIe 4.0 x4, 1x PCIe 3.0 x4 |
| SATA | 4x SATA 6Gb/s |
| RAID | RAID 0, 1, 5, 10 (SATA), RAID 0, 1, 10 (NVMe) |
| Rear USB | 4x USB 5Gbps Type-A, 2x USB 2.0 |
| Front USB-C | 1x USB 5Gbps Type-C header |
| LAN | Realtek RTL8111H Gigabit |
| Audio | Realtek ALC897 (7.1 channel) |
| Display | HDMI 2.1, DisplayPort 1.2 |
| Dimensions | 243.84 x 220 mm |
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