Quote:
Originally posted by satanicoo
Could you post the best, or one of the best, cost-prohibitive solutions you have came across? 
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White Water design, but slightly finer/smaller. About 0.5C better, or what amounts to diddly squat given the extra cost to machine that small (using slitter saws). Once you get below 1.0mm for either milling or sawing in C110 copper, tool wear becomes an increasingly larger proportion of ongoing costs, especially if you want to make it with any real speed.
I kinda feel that the White Water design is at a near dead-end with respect to improvements. Yeah, you can eke out about another 0.5C for a hot (a real ~80W) CPU, but getting something like 1.0C better on a hot CPU isn't going to happen through further tweaking of the White Water design. At least that's the conclusion I've come to after banging my head against that nut for too long. The current WW design just happens to be a happy balance between performance/cost, and pushing the design further yields dramatically diminishing returns, and further, pressure resistance starts to climb fairly dramatically (and quite unacceptably) if we drop too much below 1.0mm channels.