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will there be a risk for condensation on the res and tubing
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I don't think so the heatsink will be highly inefficient, but as ]JR[ suggested a temperature prop and sensor you can keep the water temp always abve the dew point.
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Shaving 5C would probably require somewhere between 200-400w of pelt depending on various factors. You'll need two 400w supplies.
Or you could put the pelts directly on the CPU and lower the CPU temps but several times as much
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Personally I don;t want to put a Peltier anywhere near my mobo/CPU.
I wounldn't have thought that you would need a separte 400W for an 80W Peltier, especailly as the Pelter is just helping the transfer of the heat from the water to the heatsink/fans. It would work without the Peltier just not very well at all. the Peltier will just be thee to ensure a continuous flow of heat out of the water to the outsiide.
I think it would cool the water but not by much at all, but if it mean you can switch you fans down to 7V rather than 12V then alls the better.
~ Boli
(Allways just that little bit more)