Can you explain the different versions of PCIe ?

PCIe Gen pcie slot configuration gen1 gen2 gen3 Slot 9 Auto Gen1 Gen2 Gen3 Gen4 Set the PCIe slot as Auto, Generation 1, Generation 2, Generation 3, or Generation 4 ; Slot 10 (For pcie slot configuration gen1 gen2 gen3 Socket Configuration ->VMD config for PStackN PCIE Slot Location Auto Gen1 Gen2 Gen3 Max Payload Size PCIE Max Payload Size Selection

pcie x4 in x16 slot 6 SATA3, 1 Hyper , 1 ; 2 USB Gen2 , 8 USB Gen1 ; Dragon LAN *Not