pci slotPCIe slots, also known as PCIe expansion slots or PCIe connectors, are physical slots on a computer’s motherboard that allow you to install various expansion cardsPCIe 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,