R9 280x Electric buzz

Hello, I have problems with my R9 280x Gaming.
When the graph is set to 1020mhz in any game, you hear an electric buzz in the graph (not the fans).
I've looked and seen that I am not the only person that happens, this has solution? I do not think it's good for the graph.
If with the low to 600Mhz OVERDRIVE does not .. and 800 makes it less than 1020.
thanks

test the card in another PC, this also can come from board or PSU

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PS sorry for my English, I'm italian

At least get the free diagnostic test which the AS & AASP's offer. This is the only way you will get confirmation of what exactly is wrong w/your iMac. You can always come back here to tell us what the problem really is & possibly get some DIY (do it yourself) instructions and/or links.
Since you reside in Italy does the following pertain to you? CLICKY CLICK---> EU-wide Consumer Laws

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I get the issue with quiet buzzing on my MacBook Retina 2.3 from Apple fixed.
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R9 280x Electric buzz

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