I guess Windows 7 will "run" on almost anything. the question is will it run so that you can work? I just installed it on mylaptop to try it out. works well. Maybe try out a leaked 7600 version. People say it woudl be faster than 7100. I have 7100 and it is faster than Vista.
on my laptop RC 7100 feels as fast as XP. but it is a dual core. Vista (and possibly Windows 7) d a great job using multiple cores better than XP. but that doesn't help you either.
My laptop has onboard grafix or whatever it has. So Windows 7 itself works fine. Not sure if you don't have up to date drivers
. For my desktop I'm jsut using Windows 7 drivers that are included since Gigabyte doesn't have Windows 7 drivers yet.
I assume since you paid for Windows 7 you will want to use it anyway. Especially since a newer CPU would not cost more than Windows 7.