Coil noise. Might be the video card, the mobo o more likely the PSU. Remove the side panel and make a cornet out of some paper and listen and see who's the culprit. It's nothing that can damage the PC. Try to swap some power connectors around or use some unused ones.
Seems like its coming from the vid card.
I swapped the order of the 6-pin power connectors in the vid card and i reseated the vid card.
Still has the noise.
and did you mean the cornet wont damage the PC or the noise means nothing harmful?