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I'd rather build a CO2 cooled system. I almost did it once, but gave up after I couldn't find a solenoid valve that could handle more then 100PSI (and if you regulate it it loses a lot of its cooling properties).
Basically the idea was to run liquid CO2 through a liquid cooling water block, and bleed it through a radiator with a fan pulling air inwards.
The CO2 would expand in the water block, rapidly cooling its copper surface contact. IT would also cool the radiator, and by pulling cool air in with a fan, you are cooling the whole system.
One problem- condensation.
On the water thing- I'm not sure about oxidization of metals inside chips and solders, but I think dust will dissolve in water and become an electrolyte.
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