I have an ASUS R9270X-DC2T-2GD5 card that I just got. Put it in and am running cgminer with the following settings:

–thread-concurrency 15232 -I 19 -g 1 -w 512 –gpu-fan 85 –lookup-gap 2 –gpu-engine 1130 –gpu-memclock 1500 –gpu-powertune 20

I have also tried:

–shaders 1280 -I 19 -g 1 -w 512 –gpu-fan 85 –lookup-gap 2 –gpu-engine 1130 –gpu-memclock 1500 –gpu-powertune 20

-I 19 -g 1 -w 512 –thread-concurrency 26496 –gpu-powertune 20

Anyway I try it I get about 370Kh.

Also have (at the beginning of my batch file:
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1

I am using cgminer 3.7.2.

Any suggestions?