This topic is a mess, i got a R9 280X, i spend more than 1 hour reading and testing things here and I still do not know if my hashrates are good.

R9 280X:
X11 = 3,1 Mh/s
X13 = 2,5 Mh/s

I wont push my GPU to more than 1040 mhz<--That's why!