The 680i is crap with Quads so the 650I will be more so.
Not that crappy. They will run a quad up to 3GHz very well. I ran my power hugry QX6700 in this board for over 12 mths, 24/7 fully loaded, 100% stable, beautifully reliable. About 9 mths at stock 2.66 and 3 months or more at 3Ghz. It's only if you want to go over 3GHz and go to 8GB of RAM that you'd want to change. I wanted to do both, so I did, got the P5Q.