The Gigabyte B550 AORUS PRO runs PCIe 4.0 on the primary, Gen 3 for expansion

What PCIe slots are present on the Gigabyte B550 AORUS PRO?

The B550 AORUS PRO follows the proven B550 formula: PCIe 4.0 where it matters, Gen 3 everywhere else. The primary x16 slot runs at Gen 4 x16 from the CPU, a second x16 slot drops to PCIe 3.0 x4 through the chipset, and there are two PCIe 3.0 x1 slots for smaller expansion cards. The AORUS PRO sits in the sweet spot — Gen 4 for your GPU, Gen 3 for everything else.