I run my gtl ref at 70%, it seemed to help some but anything higher hindered ocing. I know some cpu's are different as far as fsb walls, mine is 540 which was the same I got on the dfi dark. There is nothing I can do to get above that. I am not sure what it would be on air or water.

You all gotta experiment with your settings to find out what works best or what can get you over a wall and usually maxing voltages doesnt help and infact can hinder ocing attempts.