LOL.
My 270s do about 1.36-1.38 Mhs with the following parameters:
--worksize 256 --intensity 18 --thread-concurrency 20000 --gpu-platform 1 --gpu-engine 1180 --gpu-memclock 1500 --temp-cutoff 85 --gpu-fan 0-85
Thank you. I managed to get 1.45Mhs with gpu-engine 1260.