Will PCIe x1 x4 cards work in x16 slot?

What is PCIe x16 Slot pcle x16 slot An x16 slot accepts up to 16 lanes, but fewer lanes can be assigned Figure shows the concepts of PCIe lanes Notice how one lane has two pcle x1 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

pcle slot PCIe x16 slot, but that card will receive less bandwidth Similarly, you can insert a PCIe x8 card into a PCIe x4 slot, but it'll only work