The difference in energy to heat water from 0C to 1C compared to 2C to 3C is huge. When ice melts, or liquid evaporates, or any phase change occurs, intermolecular forces are disturbed. Doing this requires a TON of energy. Furthermore this energy does not get stored as heat.
I forget the exact number, but melting ice requires more then enough heat to make the same amount of iron glow hot (I think it was iron, don't quote me on that). The idea is to use some sort of liquid that will phase change right arounf CPU temp and then again around air temp. THat way it will suck heat really fast of the die, evaporate (and take the heat it absorbed with it without actually being warmed itself) and then can condense again by dropping heat to the air in the room once its well away from the CPU.
It similar to a bong cooler, but the same coolant it used over and over and the unit would probably be selfcontained without a pump.
Sorry if that was long and confusing.
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