Bravo, Prometeia evap temp is aprox -30°C right, how much do you think it's internal diode temperature of overclocked athlon tbred cpu, I doubt it's much lower then -5°C, depends a lot on voltage of the cpu but in the same conditions there is no way you can compare heat transferr ability of let say micro channel water block to something like thick base copper evaporator, so the difference wouldn't be that great if you can cool water to ~0°C