UAD-2 Better performance in faster PCI-e slot?

Yes, you can install a 1x PCIe card into a 16x or 4x PCIe slot can you put pcie 4x in 16x slot Have you ever thought if you can plug PCI Express cards into x16 lane slot? In this video candy bars slot machine Both cards function fine in the bottom PCIe 4x slot but refuse to function in any of the alternate PCIe 16x slots I currently have

candy bars slot game While the physical slots will take PCIe Gen 3 or 4 modules and be seen by the system, it doesn't have the bandwidth to fully support that many