MSI has developed a cooler that makes use of the Stirling Engine Theory, thus using no electricity, instead utilizing heat. The Stirling Engine works by trapping heat in a closed circle, and constantly heating and cooling it, which makes the air expand and contract. This then makes a piston move up and down, which powers the cooler’s fan. In this case, the air is heated from contact with the northbridge, and then cools by contact with the heatsink.

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