PSU making a humming sound?

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18 Jan 2015
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So while I was gaming, I heard a oscillating humming / *Wubbing* sound as my GPU increases in temperature.

I am leaning more towards the PSU making that sound more so than the GPU, but it's pretty damn difficult to distinguish from which one it's coming from...

Any ideas?

Edit: PSU is Supernova G2 750 W, sapphire r9 290 gpu

After further inspection, I feel like the sound is actually coming more so from the PSU.

Is this normal?
 
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