Can I put a PCI-E x16 gpu in a PCI-E x16 slot?

How to find out if your computer has a PCI express x16 slot can i use a pcie 4 0 gpu in a 3 0 slot It might be possible The length may need to be shorter The only thing stopping gen 4 speed is the quality of the cable PCIe does link candy pop slot Dual Channel DDR5：4*DIMMs XMP Memory Module Support; Next Generation Storage：2*PCIe x4 Connectors; EZ-Latch：PCIe Slot with Quick Release

can you put a pcie x4 in a x16 slot Due to the forward and backward compatibility, a PCIe GPU will perform like a PCIe GPU card if connected to a PCIe (or in the future