R9 270x -->205KH
setx GPU_MAX_ALLOC_PERCENT 100
.... -g 1 --lookup-gap 2 -w 256 -I19 --auto-fan --temp-target 84
No HW and no thread-concurency needed, default timings

not for me, hashrate shown is ~200 kh/s with those flags and default settings in afterburner, but all I'm getting is a rapidly increasing number of HW and no accepted shares. Also overclocking this just got me a bluescreen
I'm using the modyfied cgminer from the main thread