So... I've installed my 280x (ASUS R9280X-DC2T-3GD5) yesterday and having a hard time to get more than 575-600 kh/s with it.

Windows 7
Catalyst 13.12
cgminer 3.7.2 with:
"gpu-threads" : "2",
"intensity" : "13",
"worksize" : "256",
"shaders" : "2048",
"thread-concurrency" : "8192"

GPU core clock is 1070mhz
CPU mem clock is 6400mhz
GPU temp is around 74celcius (fan at 55%)

Increasing Intensity gives me hardware errors

what else can be done?