got a very serious coil whine problem. Under load (like games or e.g. heaven benchmark) the graphics card produces this coil whine. Got a 750W Supernova G3. After some researching i tried to monitor the 12V reading of the PSU under load. It fluctuates between 12.099V and 12.164V. The funny thing is that I had whits problem also with my old GPU and 2 other PSUs. So could this time be my PSU faulty or could something else like for example the mainboard be the problem?