I had the infamous GTX970 coil whine. It did it sometimes even when not gaming, during super bright scenes in videos and pictures. It changed pitch depending on brightness, it was not a consistent note or level. I RMA'd the card over it and the new one had coil whine too. (EVGA) Less, but still there. It's like a dog whistle that just barely crosses into our hearing spectrum. It was maddening!