Ben, look at the good side, what alchemy said could be interpreted as: Your block sure is not going to start a revolution, but it could perform just de same that the best currently available.
But I suspect from those numbers, 3ºc between water and copper would be extremely well for 100w heatload. Let`s guesstimate some numbers:
1.5ºc delta in TIM
2.5ºc " inside copper
3ºc " in water
4ºc " in rad.
---------------
10ºc delta temp between cpu and cooling air.
That equals 0.1 C/W
|