Rma'd my third Ti this weekend for coil whine. I refuse to accept it is not a fault after paying £800!
I have had various GPU's and I will have to say that coil whine is pretty much normal, you will get it under some circumstances eg. very high FPS, and your card most likely will buzz during use etc. Also monitors or TV's are likely to have coil whine, it just happens, you can spend your life returning hardware due to coil whine or just accept that it happens. Some are ridiculously loud and should be returned, but expecting it to be silent is just going to be a lot of hassle for you (and the end result will be a card which still has coil whine).