There are two things at play here - one is the the PCI version number (1.0/1.1, 2.0, 3.0) and the other is the number of "lanes".   PCIe 1.x is 250 MB/sec per lane PCIe 2.0 is 500MB/sec per lane PCIe 3.0 is 1000MB/sec per lane   Each card's maximum number of lanes is determined by the card's physical design (i.e., literally the length of the PCIe bus connector.)   A 1 lane card is the shortest, and a 16 lane card is the longest.   The motherboard
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