Ok, for those who missed it, I pulled (and I mean "painfully extracted") a bit of relevant info, from the OCAU thread:
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For an 80W CPU, the theoretical limit for a "perfect" waterblock is ~4.4C better than the White Water at 10lpm flow rates.
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For example, for an 80W 100mm^2 heat source on the White Water with 10lpm flow rates, the total temperature rise is ~14.0C. Of that 14.0C, 8.0C is due to the thermal paste, 1.5C is due to the copper base-plate itself, and 0.1C is the amount that the water would be heated up by. Those are all values that can't be altered. So the 4.4C that remains is a measure of the efficiency of the block at 10.0lpm.
For the Cascade, that 4.4C is being brought down to around 2.5C, and it's taken a LOT of refinement using the most efficient known way to use water to cool (impingement), to get it that far.
I've come to see the Cascade as the final destination in my water-cooling journey.
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So to improve on this, I think I'd take another serious look at that darn TIM joint!
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