It's been know for a long while that if you want to test the two manufacturers performances, you should force the one to use better quality on it's textures than it does at default.
To be fair, I had to check the date on the report cos frankly I've seen this a long time ago, around when the 4xxx or 5xxx series came out I think. To me it looks like they took the same report and splashed 7xxx series logos over it.
May be unfair in the fanbois pov, but when whizzing around at 200fps, what difference do you really notice ? If you bank your verdicts on quality setting tho, you should take note.