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I'm surprised on the CPU's, but that's why I'm asking... I'd only seen one or two other discussions that involved multi processor boards, and they did parrallel.
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People need to sit down and do the math before they build
Say a high flow system moves coolant at 1 ft/s through a 1/2ID system. That means every second 9.5 cubic inches of coolant move through. That comes out to 155 grams of coolant in metric.
Assume water with a specific heat of 4.186 j/g. That means a heat capacity of 650j/C. So you'd need to input 650 joules per second (watts) to heat the coolant 1 degree. With a hundred watt CPU that means the second CPU gets heated all of .15C hotter then the first!
Thats why its safe to assume temperature is more or less constant inside the loop. And those numbers are conservative. 1 ft/s isn't all that fast, and few CPUs actually put out 100w continuously even when OCed.