I have Quake 4 I play on Vista with a SATA2 750 Seagate HD which has a 16 MB buffer and I put it on high resolution for lack of a better word and the mouse was sluggish. I put Quake 4 on a SATA2 1TB Seagate HD which has a 32 MB buffer and put it on high resolution and the mouse is as smooth as silk. Is it because of my better hard drive, Windows 7, or the 64 bit OS that Windows 7 is on. I think it's because of Windows 7 period and my better HD might have a 10% enhancement but is the 64 bit OS helping any because this is a 32 bit program. This is the same computer. Any ideas why my game is running so smooth?