According to Windows Help:
A computer with a base score of 4.0 or 5.0 can run new features of Windows 7, and it can support running multiple programs at the same time.A computer with a base score of 6.0 or 7.0 has a faster hard disk, and can support high-end, graphics-intensive experiences, such as multiplayer and 3?D gaming and recording and playback of HDTV content.