What is the difference between PCIe Gen 3 and PCIe Gen 4?

You could try setting the bios to bios mode or UEFI mode You might also try playing with the Slot Disablement settings in the BIOS>Integrated

The most common PCIe slot currently in use are PCIe x16 slots, PCIe x4 slots, and PCIe x1 slots as shown in the picture below This particular

pcie 4 card in pcie 3 slot A PCIe x1 slot has only one PCIe lane Although there is only one PCIe lane, the PCIe x1 slot can be used for various low-power PCIe

pcie slot x16 You have a couple options available to you 1) First is simply looking at the motherboard, many times printed on the PCB near the PCIE slot