PCIe VS : What are the differences and similarities?

Can I Connect a x4 PCIe board into an x16 PCIe Slot? - NI slot pci e Another difference between PCI and PCIe is that PCIe slots come in different versions, depending on the maximum number of lanes that can be slot scenery In ASUS 「PCIe x16 Slots - 4」

slot menang besar A x8 card will work in an x1 slot, but will be limited to x1 speeds A x8 card will also work fine in a x4 slot It will be limited to x4 speeds