it is something bothering me too... and I have been at it, trying to find that limit...
I however do not listen to anybody telling my it's impossible to do anything... such people belong in the government, and they should stay there.... as far as I'm concerned anything and everything is possible...
So far, as reputable as my methods of measuring is, or not,...... the closest to that limit I came is what I'm running at right now....
air:23.2ºC
water 28.6ºC
CPU0: 33.1ºC (Duron 1g at 1150)
CPU2: 33.0ºC (Duron 1g at 1150)
CPU3: 36.1ºC (athlon 1700+ at 2000+)
I guess it's like doing the 100m sprint.... as long as there is a difference between water temp and core temp, there is room for improvement...