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Bad PSU?

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Last response: in Components
December 29, 2011 2:30:26 PM

Hello all,
I have strange problem. After using my 4 years old PC for 3-4 hours, I start hearing this sound (I`m guessing it`s coming from PSU): (Open it with iTunes)
Usually, I get it when my CPU or GPU is a bit loaded (gaming/converting videos), but sometimes (after more then 5 hours of usage) it goes on while I`m just scrolling Youtube page. I don`t hear this sound when I just power on PC. It becomes louder and more frequent by using computer. Oh, and it starts even faster, since I overclocked my E6750 from 2.66GHz to 3.2GHz (stock cooler, no vcore adjustments were made, also I have slow 667MHz RAM, maybe it`s too much oc for it?). Also, I`m running my 8600 GT OC`ed about 15%. Temps are quite normal: CPU doesn`t go higher than 62C, GPU - 72C. But my biggest problem is that after this sound, gaming (WoW/MineCraft) freezes (system becomes unresponsive for about 30sec-2min) my PC, and after 3-4 freezes it restarts by itself.
My PSU is made by Inter-Tech (I got it with case)
38A (on 2 12V rails)
Anybody had similar problem? Any help would be greatly appreciated :) 

More about : bad psu

a b ) Power supply
December 29, 2011 3:21:31 PM

fan sound running at max from psu to cool down
January 1, 2012 6:17:28 PM

Actually, i don`t think that PSU is overheating. It only becomes noisy while playing games or converting videos. If I stop doing it - PSU almost immediately becomes less noisy. Any other thoughts?
a b ) Power supply
January 2, 2012 2:43:06 AM

another thing your temp at 72c for graphic is a bit high the max i have is 56 c