Hi,

I setup my 2x Asus R9 280x (default clocks are 1070/1600) and I have have tried to adjust the cgminer settings today (--thread-concurrency, -g, --gpu-memclock and --gpu-engine). Numbers seems to be fine (GPU#0 743Kh/s and GPU#1 761 Kh/s), when compared to others results.



Cmd:
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
"C:\cgminer\cgminer.exe" --scrypt -o stratum+tcp://stratum.dogehouse.org:3333 -u x -p x --thread-concurrency 11200 -g 2 -I 13 -w 256 --gpu-fan 30-80,30-80 --temp-cutoff 90,90 --temp-overheat 85,85 --temp-target 72,72 --gpu-memclock 1500,1500 --gpu-engine 1080,1100 --gpu-powertune -20,-20 --expiry 1 --scan-time 1 --queue 0 --no-submit-stale --lookup-gap 2

I am adding the two missing similar GPU's to the system as soon as I get the damn riser cables I am pretty happy with the results now