PCIe x1 Card Not Working in PCIe x16 Slot

What's the Best PCIe slot thingie you guys ownhave owned? pcie x1 slot function The PCI Express x16 slot is a versatile and powerful expansion slot that offers high-speed connectivity for various peripheral devices With pcie 40 in 30 slot Another use of PCIe x1 slots is a TV tuner card With a PCIe x1 TV card, you can let your device receive television signals directly on your

pcie 4 nvme in pcie 3 slot I have tried several PCIe cards in my x370 Gaming Pro Carbon x1 slots, and I am not able to get either of them to function properly