This is the noise my one makes. Watch it all the way through, its tough to actually hear it from my iPhones microphone until you lean in, but its very much noticeable in person.)
https://www.youtube.com/watch?v=luEao3H1v_w
Because I don't have access to a high end PSU, I don't have any way to test this. I don't want to ship it back to OC only to be told its my rig... so I have decided to just live with it, either by cranking the audio up (although its annoying still there when things get quiet in game) or putting headphones on.