Thanks for the answer.
Do you get at least 30 MH/s? I can't go over -mclock 1890 MHz, and my hashrate stays under 29.50 MH/s.
I haven't noticed anyone reports that they can get 30mh for 6600 Non-XT. I think PM shows the highest number. Mine is about 29.4Mh from the miner. Most people say 28.9 to 29.1Mh.
I set mclock to 1900 in config and the GPU actually runs at 1890Mhz. I tried using Radeon software for OC and set memory clock to 1900 maximum, the GPU still runs at 1890. I guess that it is the limit for this GPU.