Coil whine is fairly common with any PSU. It varies upon the user(s) and their optical spectrum of hearing at certain frequencies.
Also, that PSU is junk, just saying. It's nothing but a glorified 400W POS.
Fully aware its junk. And the coil whine is very loud, loud enough to be heard in another room, it shouldn't be that loud.
The PSU was just because I was short on money, I planned on upgrading it once I had enough. I still figured it could at least power a 6850 and a 5770, I guess I was wrong. Now it screams at me when only using my 6850, but this is new. I have been for months and it never did this. Now I introduce a 5770 and after a few hours its stuck permanently, removing the 5770 doesn't stop it.