Make sure you take the case cover off and get a paper towel roll and put it up to your ear. See if the sound actually is the GPU or the PSU. I've had this a tim

Make sure you take the case cover off and get a paper towel roll and put it up to your ear. See if the sound actually is the GPU or the PSU. I've had this a time or two, swore it was the GPU and it wasn't. RMA'd the PSU and my "GPU coil whine" was gone.