Currently getting about 330 Mh/sec on a 7790.
Can you please post your settings? Also Wattage if possible.. Thanks.
Core: 1275
Mem: 150
Using cgminer with "-I 8 -g 8 -w 512 -v 1 -k diablo".
Regarding wattage, the 7790 is voltage locked so not much I can do there. GPU-Z shows it bouncing between 96 and 98 watts. Funny thing is, I have this running in a Dell X51 which uses a 230 watt external power brick.