Asetek has released a line of Vapochill CPU heatsinks designed to be air cooled, not watercooled.  There are 3 models in the series, and Overclockers Online has posted a review of the Ultra Low Noise version.  It performs fairly well, and does so nearly silently.
“The addition to the Asetek arsenal is more traditional than a phase change or water cooling system, but still cutting edge in its own right. The VapoChill Micro series is powered by Asetek’s patented vapor chamber technology and is what I will be examining today.”

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