I have a R9 270 and a HD 7970 on my PC and I use it to mine. Yesterday, it mine just fine with around 2 Mhash from the R9 270 and 3.3 Mhash from the 7970. But when i tried to mine now the r9 270 only produce around 1.2 Mhash and the 7970 around 700 Khash. My settings are  --thread-concurrency 8192 -I 13 --lookup-gap 2 --worksize 256 -g 2 --gpu-engine 1160 --gpu-memclock 1450 --no-submit-stale and I'm using catalyst 14.4. But even with the gpu engine and the gpu memclock the sgminer only report 300 Core and 150 memclock from both the gpu. And I can't seem to change the clock speed reported by sgminer even with amd overdrive or msi afterburner. Any help would be appreciated.