Might be possible, I think adding a diode and a large capacitor parallel to the fan circuit would do the trick. Might be a good idea to use a resistor or transistor to regulate the current through the capacitor; helps to prevent excess inrush current, and allows the fan to spin linger though slower.



I'm not sure how much capacitance is needed, but I'm sure it would be at least a few hundred or more likely a few thousand uF.

Saw it before, but I was thinking, hey thats pretty easy to do..no need to buy la..basically can just route the 5vsb to the fans with a diode to prevent shorting it with the 12v line. Thing is must mod the 20/24 pin connector or use a pass through adapter.

Its usually not the PSU's fan that's noisy, its usually the processor fan. Processor fans today more often than not are temperature controlled, so if ventilation is poor, the PC will be hotter overall making the fan spin faster and noisier.

Sometimes its also the resonance of the fan with the casing or nearby objects. Usually with lighter casings the casing is the culprit, if its the case pressing the casing will cause the resonance properties to change and the sound will also change as well. If its something other than the casing, the sound will only change when the casing is moved from one plac to another. If neither is the reason, then its something else. The first explaination I gave is far more likely to be the reason.

You guys got it all wrong..

The measurement for fans when listed in mm is the length from one edge of the frame to the other, not diagonally, not from screw holes. Example: an 80mm fan measures 80mm from left edge of frame to right edge of frame. Measured from screw holes it would be less than 80mm, measured diagonally will be more than 80mm. If you want the exact details of the fan measurement, pull up the datasheets for the fans & study the technical diagram, its accurate to a fraction of a mm.