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 slots come in a variety of physically different sizes referred to by the maximum lane count they support, ie. x1, x2, x4, x8, x16, and x32. A PCIe card will fit into a slot of its size or bger,