phase-change
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Anandtech [Anandtech] Raijintek Pump-less Phase-Change Closed-loop Liquid Cooler
http://www.anandtech.com/show/10398/raijintek-shows-off-pumpless-liquid-cooling-system Interesting concept...but the radiator must be installed above the block (I'm wondering if there are any additional orientation restrictions) and the operating environment must be suitably cool (they gave...