PCI Express x16 graphics card in a PCIe x16 slot?

What is PCIe? Understanding PCIe Slots, Cards and Lanes pcie 2 slot PCIe cards that were working on older slots I want to know if I can use my old NI PCIe cards on the new computer because I'm not pcie 4 ssd in pcie 3 slot PCIe x16 Gen expansion backplane with two slots The PCIe x16 Gen3 backplane has two PCI Express x16 slots, with one slot supporting the OSS target

pcie slot gpu PCIe cards that were working on older slots I want to know if I can use my old NI PCIe cards on the new computer because I'm not