the coilwhine seems occur on other gtx 970, too. including EVGA and NVIDIA.
check this post: http://www.pcper.com/news/Graphics-Cards/GeForce-GTX-970-Coil-Whine-Concerns
check this post: http://www.pcper.com/news/Graphics-Cards/GeForce-GTX-970-Coil-Whine-Concerns