What is the Difference Between PCIe Gen 3 & Gen 4?

Even though the PCIe 4 slot is backward compatible with the Gen 3 SSD, the fact that you're connecting it to a Gen 4 slot will not increase data

PCI Express

pciex4 slot It should be backward compatible, but you will see less performance than if you had it in a PCIe slot since it runs at PCIe x8 instead

pcie slot configuration gen1 gen2 gen3 It should be backward compatible, but you will see less performance than if you had it in a PCIe slot since it runs at PCIe x8 instead