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In order to compensate, PCIe 2.0 has modified the power standard. The previous 6-pin 75W connector has now been retired, moved instead to an 8-pin 150W connector (see the Inquirer for a picture). Bus speeds have also increased to 5Gbps, meaning that a 16x card can now potentially pull up to 16Gbps. Of course, current cards are a long way from even maxing out the PCIe 1.1 interface, so this is much more of a theoretical improvement.

... Purchasing a PCI Express 2.0 graphics cards at this time is future proofing more than anything else; we haven't noticed any performance differences when comparing PCI-E 1.x chipsets to PCI-E 2.0 chipsets with the newer GPUs, and we don't expect you to either. PCI-E 2.0 may prove more useful as a way to provide four x8 slots that each offer the same bandwidth as the older 1.x x16 slots. With Triple-SLI, Tri-Fire, and talk of GPU physics accelerators, including additional high-bandwidth slots on motherboards makes sense.