PCIe Verision 1 and version 1.1 are completely identical as types, 16 lane bit paths, 1.25 GHz of frequency and able to move up to 250 MB per lane in each direction. The only difference between these two was an that there were two 6 pin power supply connectors allowing more wattage. Comparing PCIe Version 2 to version 1 there are some big differences. In version 2 there are up to 32 lanes instead of 16, the frequency was increased to 2.5 GHz instead of 1.25 GHz, and up to 500MB per lane in each direction rather than 250MB. So between version 1 and 1.1 to 2 everything was double. Very big difference and a large increase in technology.