Can I Connect a x4 PCIe board into an x16 PCIe Slot? - NI

Fitting PCIE X4 card in PCIE X1 Slot ardForum x4 slot It's a slot of x16 size but electrically x4 This x4d slot I explain in this video what is PCIe x4 on the motherboard and its uses I also explain what PCIe

omni slot The specs table says, 1 x PCIe x16 slot, running at x4 Does this mean this x16 slots header only has 4 PCIe lanes?