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

What is PCIe? Understanding PCIe Slots, Cards and Lanes pcie slot configuration gen1 gen2 gen3 Any other pci slots occupied, have you checked pcie x16 bifurcation settings and pcie config gen 1 gen 2 gen 3 in the bios of the motherboard pcie 20 x16 slot PCIe Slots are backward compatible like most of the interfaces, which means that you can use any generation card on any generation slot But

pcie x1 in x16 slot PHY Layer—The PHY layer includes the 8B10B encode and decode functions for Gen1 and Gen2 It includes 128b130b encode and decode functions for Gen3 The PHY