you are describing completely normal behavior for a switching power supply; there's no way to prevent it & they all do it
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Actually, Bob was quite correct in his response. ALL computer (read "switch-mode") power supplies have some degree of high-frequency whine. Read up on the design priciples behind SMPS and you'll discover why they make that awful high-frequncy whining.
Without being too curious as to why you have 37 PC power supplies plugged into the wall at once, might I suggest that a little quick math is in order to calculate the cumlative amperage draw on the circuit(s) in question. It sounds like you have all these power supplies plugged into one giant power strip fed from one, two or four outlets. If such is the case, you could well be drawing peak current of over 55 amps (considering an average power supply draw of 1.5 amps per unit...could be more, could be less). That's a lot of juice. You mention "apartment". Most are fed from no more than 4 15-amp circuit breakers. Might I suggest that even with no load on the power supplies, you are still drawing a lot of current, even at idle. Your apartment's power system wasn't designed to be used as a server center, anymore than it was designed to be used for industrial arc welding.
The other item of concern also revolves around the design of SMPS, and the amount of back-EMF generated by them. They spew tons of garbage back into the power line. The more backwash of EMF, and more noise all those SMPS are likely to make. By having so many of them plugged into a circuit clearly not designed for such use, you are, in effect, compounding your own problem (and contaminating probably everyone in the building (on that feeder branch)). Glad I don't live in your building. Hope this helps.
I do not have 37 PSU's plugged into the wall at once. Ive tested 37 different PSU's , all of which are having problems. I know that a light hum or whine is normal for a SMPS. A high pitched whine audible from 10 yards away is not normal especially when the PSU is not under load.
I managed to eliminate some of the whine my moving my pc into another room and onto another socket. Problem is now, this p.o.s. antec i finally settled with is having problems in 3d apps. ive ordered an ocz 600w psu which has higher amps on the 12v rails.
thanks for the help.