Can I put a PCIE X8 GPU in a PCie X16 slot?

Can I put a PCIE X8 GPU in a PCie X16 slot? pcie 8x slot I was looking into the card because the old GPU was just inserted into the slot and had no other power cables and 750 ti seems to be a similar pcie x1 slot function The pcie adapter board has a fixed fixing buckle, which can be matched with the graphics card, so that the card will not fall off from the slot This new

pcie x1 slot function PCI Express Riser Card x8 to x16 Left Slot Adapter for 1U Servers

pcie 3 slot 3pcs 98pin PCIe X8 Socket for Desktop Motherboard Slot Pin number: 98pin Quantity: 3pcs  Today that PCIe controller will either be in the CPU or the chipset A bifurcation card handles power and control signal redistribution,