When i'm running some 3d java applications my video card makes this strange hissing like sound. I know it's not the fan because i control that manually. It doesn't seem to happen for regular games. edit: it seems to be influenced by what i'm looking at as well. I can change the tone of the hiss by looking at more or less polygons. edit2: nevermind, apparently it's called "coil whine" and it's perfectly normal when running simple things at really high fps.