Airspirit- I can say I've felt how you do, this physics stuff can be so confusing. The thing to remember is no matter what the processor dissipates X watts of heat at equilibrium. It does seem like to bring the CPU temperature lower, we have to dissipate more heat, right? but thats wrong, if you "dissipate more heat" with some change, your processor is not at equilibrium anymore, and the temperature will fluctuate to a new temperature where it will dissipate X watts of heat again. The difference between all heatsinks and waterblocks, is the delta T required to dissipate X watts. Poor cooling needs a very high delta T between the Die and the coolant(air or water) to be able to dissipate X watts, while better cooling needs a lower delta T.
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