The coil whine can come from your video card see:
https://www.youtube.com/results?search_query=coil+whine
Coil Whine as Fast As Possible, Techquickie
How to reduce coil whine from your Video Card, JayzTwoCents
Ask GN 17: Why Only 99% GPU Utilization? (& Coil Whine), Gamers Nexus
Rambling about Coil Whine, Actually Hardcore Overclocking
How to get rid of coil whine, Lucas_Itanium