Well I just gradually notice a huge difference from when I switched over from XP to 7. Steam used to start up in like 45/minute...even with 3.5 gigs of ram and a quad core cpu. I've only capped 140 max fps in source games. But with 7,
Steam starts up in 10/15 seconds
My gfx card's full dx11 is being used
My full 4gb ram is being used
Pretty much get around 250-300 (300 is the source max fps limit) on most medium detailed maps.
And I can play crysis with Full AA and full settings at like, 30 fps.