[citation][nom]intel4eva[/nom]Also interesting that nobody mentioned that a phase change unit sounds like an air conditioner because that's what it is. Buzzing compressor? Ha, GTFO Origin.[/citation]
Phase-change loops are what all A/C units and refridgerators & freezers use, to the best of my knowledge. But I highly doubt it'd be anywhere as noisy as an external central A/C unit. For one, it doesn't need anywhere near as power; Sandy Bridge-E has a TDP of 130W, and only 95W for the ordinary 2600K; I doubt that even at 5.7 GHz it'd pass 200W. Meanwhile, a "3-ton" A/C unit is sucking away over 10,000 watts of heat.
Secondly, from the look of the case, it likely isn't a compression loop, but rather an adsorption unit; while they tend to be not as potent, they're MUCH quieter, since all they need is an extra source of heat, not a compressor. Plus, they don't use CFCs or HFCs for coolant, but typically use water and ammonia.