The ASRock B550 Phantom Gaming 4 runs PCIe 4.0 on its main slot and Gen 3 for expansion

What PCIe slots are present on the ASRock B550 Phantom Gaming 4?

The Phantom Gaming 4 splits its PCIe lanes between speed and practicality. The primary x16 slot runs at PCIe 4.0 x16 for your GPU — that’s the headline. A second x16 slot drops to PCIe 3.0 x4 through the chipset, and two PCIe 3.0 x1 slots handle smaller add-on cards. It’s a practical split: Gen 4 bandwidth where it matters, Gen 3 for everything else.