The well-known under the code name "Southern Islands" graphics cards, according to a report by the Turkish website Donanimhaber come as PCI-Express 3.0 expansion cards on the market. Users of older motherboards with PCI Express 2.0 or 1.0 must, however, do not worry as the new standard is also backward compatible with its predecessors.
On newer motherboards with PCI Express 3.0 graphics cards but has twice the bandwidth of 32 GB / s available, what is likely at least partially influence its performance, especially in the use of CrossfireX. The first motherboards with PCI Express 3.0 graphics card slots are already commercially available.
Properly enforce the new standard is expected but probably only after the appearance of the bulldozer processors from AMD and the Ivy Bridge CPUs from Intel, as their new motherboards support PCI-Express 3.0.