Hi I just built a new pc and when I use ATITool or Folding at Home on my 280gtx I get this slightly high pitched electrical sound, and I have confirmed it is coming from both the graphics card and the power supply (pc power and cooling 750). I also hooked up my other PSU a (610 PC Power&Cooling) and the same thing happens sound is coming from both GPU and PSU. It is very noticeable with those two programs I mentioned but much quieter with games. PC Power and Cooling tech support told me to send the PSU in for RMA. But that was before I heard the video card and other PSU doing it also. I'm thinking maybe it is the card because it's making both of the PSU's do this along with the similar noise from the card at the same time? The noise is louder from the PSU's.