just got 7790 from powercolor a week ago, the hash rate I have with -v -w 128 -f 60 is ~260M, this card has the core freq of 1075MHz, while with -w 128 -f 60, it's showing ~244Mh/s, with -v -w 256 -f 60 I got exactly ~260Mh/s, this card is really quiet so I put it in my desktop and can barely notice the noise even I'm surfing while mining.