Yesterday I just formatted by PC from XP to back again Vista (cos previously I thought that XP should be less resource hogging)..

I found that my GTA4 has higher frame rate in Vista than XP. I also tried Spiderman: Web of Shadows and seriously, before this I had stuttering problems with the graphics but now its very smooth.

I don't know why but Vista just handles dual core better than XP does. Even though I already patched my XP to SP3 and also applied the dual core optimizer but it just doesn't unlock the full potential of dual core..

btw, I am using an old skool socket 939 AMD X2 4400+ (2.2Ghz)...