I'm pulling 2mhs with these settings in a batfile

del *bin
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
sgminer.exe --kernel darkcoin -o stratum+tcp://stratum1.suchpool.pw:3335 -u turkman.1 -p x -I 18 -w 256 --thread-concurrency 8192 --gpu-engine 1044 --gpu-memclock 1600