Intel and AMD take a different strategy.
As far as I know AMD still has the pci-e controller on the motherboard not in the cpu.
Intel places most, but not all of the pci-e control system within the cpu(some still resides in the boards chipset, but what the video cards tend to use is in the cpu).
This is why with Intel CPU and Board matter, while with AMD it is all down to the board.
Do not worry, 2.0 will not cause any issues for you,