As above (thanks, Tanakh) plus have a look here [http://www.tomshardware.com/reviews/world-of-warcraft-cataclysm-directx-11-performance,2793-10.html]. Notice down the bottom it states that the CPU is throttling the performance of the NVIDIA graphics card? So to compare a 5870 was thrown in instead resulting in an almost identical framerate -
if the CPU bottlenecking was even the 5870 should put out a significantly lower framerate than the 480;
DX11 Benchmark Comparison (clicky) [http://images.dailytech.com/nimage/14039_large_GF100-1.JPG]
Sorry I can't link you to the original articles I mentioned, I may have a copy of the magazines lying around so if I find them I'll be sure to link. However, as you can see above my original comments can indeed be verified from other sources on the net.