pci slotPCIe is an interface standard for connecting hh-speed components to your PC. Learn about the different types, generations and features of PCIe slots and cards, from PCIe 1.0 to PCIe 6.0.PCIe Slot Structure. All PCIe slots are divided into two parts by a small protrusion in the middle separating them. This is why PCIe expansion cards, such as graphics cards,