--scrypt --Nfmin 4 --Nfmax 30 --StartT 1389028879 --queue 0 --scan-time 2 --expiry 4 --no-submit-stale -w 256 --gpu-memclock 1500 --gpu-engine 1100 -g 1 -I 16 --thread-concurrency 21568 --temp-cutoff 90 --auto-gpu is a good start for a 270. gets low to mid 90kh/s.