Here's the problem...
The problem with your test is that you used games that nVidia THEMSELVES requested and then tried to pass it off as a fair test. You have GOT to be kidding me. As you said, the vast majority of the games you tested had nVidia's NAME on them. Come on now, that's very irresponsible of you at best. For instance, when the GTX 260 216 is compared to the HD 4870 1Gb in GRID Racing, the GTX 260 gets absolutely CREAMED by the 4870 512mb, never mind the 1Gb. Hell, even the 280 gets beat by the ATi offerings, performing similar to the 4850! I think you should smack yourself upside the head for having the gall to base a supposedly "fair and unbiased" GPU test using the games that a company that has been proven to be made up primarily of crooks (The GTS 250 really being a 9800 GTX+ scandal comes to mind) who lock out review sites that don't kiss their green and black asses! Never mind the fact that they were able to drop the price of their GTX cards by a whopping SIXTY-TWO PERCENT when the HD 4800 series was released by ATi which of course means that they were pumping the poopers of the nVidia fanboys who bought their GTX cars as soon as they came out! Sorry nVidia, even if your card is a bit superior, even if I have had all nVidia cards from the original VANTA TNT2, your business practices have made me decide that ATi is the way to go from now on. I used to use ATi cards, the EGA Wonder, VGA Wonder and Super VGA All-In-Wonder. It looks like I've come full circle and should never have left despite the problems with some of the Rage cards.