EDIT: found a fix:
a little update guys
As you know, my card had pretty bad coil whine. i was able to fix it simply by letting my pc stay overnight on a crysis main menu screen, where the coil whine was at its worst. Did this 3 nights in a row and now its whisper quiet.
Be careful tho, card heats up pretty fast using that method, so set up a custom fan profile or just use a solid 80-100% fixed fan speed. I used 70% fan speed, vrm's hit 80c, core 75c.
Worth a shot before rma