I have an 8800 GT Nvidia card. In Vista, I could only overclock it to 740 | 1750 | 900. In W7, I've pushed it to 740 | 1850 | 950 in Multiplayer and it ran smooth and looked very very good. Unless you know something about video cards, that is a pretty high overclock for that stock card.
So gaming is thumbs up on W7.
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Not sure why you would be able to OC better in Windows 7 vs Vista. The hardware didn't change, and you're probably using a very similar driver. Did you use Nvidia's software to do the OC?
I am getting higher fps with the ATI vista 64 driver over the ATI win 7 beta driver.