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Today I am taking a closer look at yet another kind of case fan: a thermal controlled one made by Antec, a manufacturer well-known for their high quality computer cases. What does that mean? Well, in short, it means that the fan will adjust its speed according to the temperature in your case. That way, your fans will only bother you with "noise" when it is necessary, a.k.a. when your case temperature is getting too high. If your case temp is low, your fans will know and spin at a much lower speed, resulting in less noise. Are these fans for real, or is it just a marketing stunt? O² investigates and reports ...
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http://www.overclockersonline.com/index.php?page=articles&num=145