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#61
I have the actual ThermalTake smart fans which are made to be variable and use a controller, they do cost more but are worth it. They also have a much higher output than the regular cheapy fans. My system has 10 fans including the one in the power supply. I use a sunbeam rheobus extreme 30 watt 6 knob controller. It's nice to be able to turn them all down to barely audible yet still useful range, or on the hot days you can crank them up if required.
When overclocking, it's best to run your fans directly from the power supply rather than using the headers on the motherboard.