cyco: I clocked it up to 2.5 ghz at 1.825 volts last night. Its still going after a night of prime so it seems stable. right now its 107 (42 C) load with 82 (28) ambient. That does seem high as I was getting around that with air cooling...although my overclock was only 2.37 at 1.70 volts (old chip did low ghz at low temps, but couldnt get higher).
The fan is pulling through the rad. Of course I know about dead zone

The thing is, the air coming out the fan only feels a few deg hotter than the ambient. if I feel the tubes theyre noticibly warmer than ambient.