motherboard power circuitry whining noise

[Randa71]

Hi all,
this is my problem (i don't know if there is a problem or not): when doing cpu stress test (ex.linX) i hear a low whining noise from the motherboard (this sound come from motherboard capacitors?).
motherboard is a ga-fx990-ud7 and the cpu is a phenom 1100t slightly overclocked (3.8ghz on all cores with 1.344v max on full load - cpu temp is ok...on full load 51 max - power supply is an ocz z series 850w)..
system is very stable but when linx start stress test i hear this slightly whining noise.
i've tried with fx 8150 and the whining noise is slightly higher than with the phenom.
is this normal? or i must be worried about that??
thanks for all answers.

[autotech]

First thing i would of done is get a different  PSU and try it with that.   Durring a stress test you are consuming alot of power and the part that shows it as much or more than the motherboard is the PSU.  You tried a different CPU wouldnt hurt to try a different PSU if you can. Might narrow it down a bit..

After that if you a running a video card try a different one. I am assuming that when you tried a different cpu you also used a different cpu cooler and is why i am skipping that step. If after all this your motherboard still whines and you feel uncomportable with it contact gigabyte support, they will probably suggest a RMA to be safe. Or they might have run across it and know exactly what it is. I have used 3 to 4 hundred motherboards and not 1 whines so id say it isnt normall.

[Randa71]

problem solved!!! fortunately it was not the mainboard but psu....i've changed it and it's ok...silent pc.....and has gone away videocard-gpu electric noise too...!!!!!!!!!but there is a thing that i don't understand: i've used a lot of psu during these years (700w-850w ocz-cooler master-enermax) but every NEW psu when gpu was under load (furmark o crysis) was always rumorous....i thought that was videocard but instead was psu....but why a new 850w psu (with others psu it was the same thing) should be rumorous? with only a gtx580? i know that gtx 580 is power hungry but there is a lot of room in a 850w.... i thought that with only one videocard psu should be silent if it is a 700w or 850w....am i wrong? because it is not possible that all my previous new psu was all defective......

[Dark Mantis]

Hi

Extraneous noises can be extrememly hard to track down especially when they are not there constantly. Often as autotech said this is often caused by the PSU or a combination of components. Quite often it is caused by coil whine but capacitors can also cause it. The trouble is that it is usually a combination of more than one item and so it can be hard to say what actually makes it happen.