Techware Labs has just completed a review of the SilenX 400 watt power supply.  Here is a clip:

"In the struggle to cool a PC faster and more powerful fans have been used which consequently produce air turbulance and increased noise. Some may think of it as the price that one pays for a cooler computer, apparantly SilenX thinks that proper cooling can be done without the added cost of noise. Its a philosophy that most PC enthusiasts and even the average user will welcome with open arms."

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