It's still not named well but the way to understand it is: gen 1 is 5gbps/lane, gen 2 is 10. x1 is 1 lane, x2 is 2. So really there are only 4 combinations, 5,

It's still not named well but the way to understand it is: gen 1 is 5gbps/lane, gen 2 is 10. x1 is 1 lane, x2 is 2. So really there are only 4 combinations, 5, 10, 10, 20. It just took them a really long and windy time to get there.