Hi diablod3 I am facing some issues using this miner with dual 6990. With -f 1 the hash rates drop to a whooping 600000 low. I tested out different flags and found that -f 17 to 20 is the best with the highest at 1ghash/s. This is very stable compared to poclbm which fluctuates from 800mhash to 1.2ghash. I am using 11.3 + 2.4 sdk like u recommend. The preview 11.4 drivers + 2.4 sdk yield the same results. I am using windows 7 64 bit. And the only way to get the software to recognise the dual 6990 is to crossfire them. Any advice u could give me?

Thank you =)