Windows Se7en

Last two months i have been trying windows seven beta on my new machine. Its looks pretty cool and stylish OS. I tried both 64 and 32 bit versions of build 7000 and 7057. build 7000 was ok and 64 bit was better performer. i was able to play CoD4 , HL2 etc without glitches. but with 7057 had some sound glitches with CoD4 and NFS undercover was lagging. seven supported openGL versions upto 2.1 extensions fully and some v3 extensions only with latest (beta ) drivers from nvidia . meantime vista supported opengl v3 extensions fully and cod nd undercover running smoothly at my maximum resolution 1440x900.