bear in mind that the HD 7790 isn't part of the HD 7000 series.
This basically means horrible driver support as of now: No new beta driver works good with this card, the newest driver is from 4-17-2013 while new beta drivers come out every 2-4 weeks.
To put this into perspective: HD 7790 runs on driver vers. 12.1 while the newest beta driver is 13.8.
I have a HD 7790 myself and have a problem with the driver vers. 12.1 (it corrupts my sound from my PCI soundcard) there is no solution for this problem for 2 months now.
btw. I own a HiS HD 7790 and while they have good and dedicated support, they can't write a driver themselves.
Apart from the driver-fiasco the HiS HD 7790 is a very, VERY silent card (fanwise) and does not make any tearing noise itself, nor does the fan has any kind of squealing noise. I have the scythe mine 2 CPU cooler nearly turned off and the card isn't audible in idle mode (its fan runs with 1130RPM at idle).