HD5970: --> 344KH
HD6870:-->  152KH
HD5870: --> 199KH
setx GPU_MAX_ALLOC_PERCENT 100
 .... -g 1 --lookup-gap 2 -w 256 -I18 --auto-fan --temp-target 84

NO HW and no thread-concurency needed, default timings

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