have you tried setting everything to auto?
Initially I found the same thing with my board. I set all the voltages myself and tried ocing, but it would freeze in windows boot at 410. So I decided to work backwards, leaving all my voltages on auto, seeing how high i could get with that, then manually modding key voltages to get higher. That got me 480 fsb on auto and 490-95 with some NB and cpu tweaks.