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Mini sealed Stirling cycle units, could also transport heat out of the CPU and be carried away by a regular fan. Any Stirling cycle engine run backwards will act as a refrigerator. The CPU heat would activate it, very few moving parts, totally sealed, and needing only sealed gas as a thermal conductor. Several gases will work with these systems. Most of the energy of heat is dissipated as mechanical energy within the Stirling engine. I don't think their is a size restriction on these systems. Perhaps even nano sized units would work.
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