| [Taken from a purely thermodynamic perspective, there are some rules of thumb for minimum temperature differences between air and water, and water and CPU, at equilibrium:
Bare minimum difference between radiator fins and air is 10ºC for a normally-flowing radiator. There's a couple more ºC between the radiator and the water. Realistically expect the water to be 15ºC warmer than the room.]
I've reached equilibrium with my air cooled system... it's 14c difference at full load...
slk900u delta ehe 80mm
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