I have R2 X51. I recently upgraded my gpu to 970, but whenever I play any games, it makes this buzzing noise from speakers/headphones. But the weird thing is, the buzzing noise disappears when I do anything else on the computer, like watching movie, listening to music or anything. This noise appears when I play specific games like The Witcher 2, Dragon Age Inquisition, or other gpu intensive games. I'm starting to think it has to do with PSU fan coil whine noise, but I'm not too sure.