I would have thought thermal conductivity for the coolant is irrelevant seeing as the idea is that the
pump is suppost to move the coolant (and the heat it carries) instead of moving the heat from to coolant using conduction.
Heres my post from anothe foum on the same question (about minerals in water helping performance)
Quote:
I doubt minerals in water help it remove heat, I wouldnt mind seeing some data supporting that. for coolant we dont really care about conduction, its specific heat we need....
It might be worth looking into, but not with copper. Water is only used because it has a high specific heat - the amount of heat needed to raise its temperature. IIRC copper has a lower specific heat (but a much higher thermal conduction).
Water is the best / most practical liquid for moving heat in pc cooling atm.
There might be better solids that can be used if made into very fine powder.
The powder would coat the insides and eventually decrease performance as more of it gets deposited leading to small areas of static coolant - the solid powder covering the waterblock/rad (which would be where the water moves slowest - res or rad, so it would need to be cleaned after a while.
Also think about how it would affect flow through waterblocks.
considering the ratio of powder to water, and the maximum amount that you could practicly use, I dont think this is worth anymore thinking about....
.. unless theres a material about 100000x better than water for specific heat - I doubt it.
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