What kind of FSB are you running?

I found that water cooling the NB is unnecessary. I took an old CPU fan and found some screws with pointed tips and screwed the fan onto the NB heatsink. This is probably not needed anyway, but I feel better about the temps, now 35c at 435FSB and 1.41v. Doing this also cooled down the south bridge substantially. Temps were up to 59c before.

My CPU can't get anywhere near the FSB limit unless I lowered the multiplier.