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Originally Posted by Maviryk
There was a recent post on this topic over at the OC forums. The nexus controller was probably using PWM instead of a Darlington Transistor to adjust fan speed. Something about messing up the motor timings. I am currently using a pair of the San Aces myself, I am not able to hear them over my hard drives at 5 feet away from case when adjusted to minimum voltage (~1800 RPM) using an Enermax Ultimate Fan Controller (uses Darlingtron Transistors).
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PWM is a nice idea that I really used to like, but fans just don't like it that much, it seems. It would be much nicer if the microcontroller in the fan would adjust the speed, because it could just reduce the pulse of current to the magnets at the correct time. Powering the fan motor microcontroller up and down repeatedly and getting it in/out of synch is probably what makes the problem happen on so many fans. Just guessing.