Really? I've not seen those benchmarks. I have seen the standard benchmarks and saw some showing that the 460 OCs well and can get closer to the 5870. Not seen anything claiming it exceeds a GTX480, 5870 or a 5970
We are talking about SLIed GTX 460s. At stock it comes quite close to an HD5970 because SLI scales better than crossfire;
Considering the card can OC 30%+ it should easily achieve speeds beyond the HD5970. Of course the HD5970 can OC as well and then it will likely be faster again(although I haven't seen those exact numbers) but considering the ~$250 price difference it is clear which is the better value.