I was simply trying to give someone a heads up on the coil whine, i'm assuming that most folks here can stand a *little* coil whine if it's non noticeable but there are some GPUs where it is incredibly loud and distracting. Apparently, a lot of 7990 cards fit that bill.
Anyway, it really is tiring to get attacked on stuff like this, you know like I said I bought 2 dual X 7970s in 2012 to potentially replace my reference 7970 cards (I had 7970CF at the time). Both of the dual X cards had horrible coil whine that could be heard outside of my computer room that not even vsync would fix, and it was a major annoyance. Needless to say I kept my reference 7970s (which didn't have coil whine) and had to RMA the dual X cards which was a pain in the neck.
That said, the 7990 (if it has coil whine) would still make for a good mining setup regardless if it's out of earshot and not being used as a regular PC. Out of sight and out of mind, I suppose.