GTX580 vs HD7970 - Head to Head Review @ Vortez
 

We've reviewed a few HD7970's now yet some people are not convinced it is worth the outlay over NVIDIA's finest - the GTX580. Some even say that there is simply no need for the HD7970 in that there are few games that require the awesome power AMD's latest graphics card bestows upon us. This may well be the case as the GTX580 is still a very fast graphics card and up until the HD7970's release, the fastest single core GPU available.

http://www.vortez.net/review.php?id=501