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.
So gaming is thumbs up on W7.