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My fan makes a slight hmmmmmmm sound, but in a distorted way. At low rpm I hear it when I am right next to it, at high rpm it's very loud. I used to just hear the fan but now I hear this humming. Any ideas?
 

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Maybe dust buildup? There isn't a sticker on the fan hub that might be getting loose and making noiose as it spins, is there? Does it go away if you touch the card while it's running (not he PCB but the heatsink cover)? Maybe it's just picking up a vibration.
 
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