What is PCIe? Understanding PCIe Slots, Cards and Lanes

PCIe x1: These are the smallest PCIe slots, used for almost any other cards like average network adapters and USB expansion cards PCIe x4:

You can place a PCIe 1x card into any available PCIe slot and it will work

x16pciexp slot 1 additional PCI-Express x1 slot is needed

x16 slot On PCIe X1, X4 and X16 slots, the first 18 pins are all wired the same, so as long as the PCI-Express card fits in the PCI-Express slot, it