Well liquid metal cooling utilizes galluim, induim and tin IIRC. The firs two are not cheap, nor are they very light. Filling up a current loop would cost more then a G7 by a long shot i presume and would add a substantial amount of weight to your computer.
I doubt we'd simply substitute metal in for water but the distance from your heat exchanger to your heatsource would have to be very small or else it will cost a lot and be rather heavy.
I have to run to class now.
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