I've changed my gtx 580 with an Asus gtx680. When i turned on my computer i directly noticed a weard buzzing sound constantly on. But the most noticeable thing is that the sound is really distorted and simply too loud when i play music or watch video clips. First i thought that the gtx 680 was behind all this so i changed back to the 580 but the problem didn't go away. I also reinstalled the audio drivers but that was sadly not the solution.
I read somewhere that the sound card can be interrupted by other components. I am not an expert on this and i would really appreciate your help.