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MSI has developed a working concept design that utilizes Stirling Engine Theory to power a motherboard fan. Instead of conventional electricity, the fan will harvest heat emanating from the processor to function.
Interestingly enough, during a recent visit to their HQ in Taiwan, MSI told TweakTown that they "would probably end up adding the world's first powerless air cooler to an Nvidia motherboard." Nvidia?

Via- [http://gizmodo.com/362646/msi-motherboard-fan-powered-without-electricity]