I get 234 KH/s with these settings on Gigabyte 270x OC edition:
timeout /t 60
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
cgminer.exe --scrypt -I 19 --thread-concurrency 10244 -o stratum+tcp://xxxxxxxxxxxxxxxxxxxxxxxxx -u xxx -p xxxx -g 1 --gpu-engine=1100 --gpu-memclock=1500
For my cards this TC happens to be the sweet spot, you may want ti play a bit with it.
Also, there is big settings thread here:
https://bitcointalk.org/index.php?topic=416572.0Anyone got good settings for a 270X?
Using -w 256 --thread-concurrency 8192 -I 12 at the moment. Getting 150KH/s.
270X should be able to get a bit higher KH/s, right? Like 180 or something?