The MSI PRO B550M-P GEN3 keeps everything at PCIe 3.0

What PCIe slots are present on the MSI PRO B550M-P GEN3?

The GEN3 in the name tells you everything. Every PCIe slot on the B550M-P GEN3 runs at PCIe 3.0 — no Gen 4 anywhere. You get one x16 slot for your graphics card and two PCIe 3.0 x1 slots for expansion. It’s honest about what it is: a straightforward, no-frills board where the savings come from sticking with Gen 3 across the board.