what's wrong with this: (i use 4x280x)
sgminer -k darkcoin -o stratum+tcp://stratum.mine-coin.de:3377 -u xxx -p xxxx -d 0 -d 1 -w 256 -g 2 -I 13 --lookup-gap 2,2 --thread-concurrency 8192,8192 --gpu-engine 1080,1080 --gpu-memclock 1500,1500 --gpu-powertune -20,-20
sgminer -k darkcoin -o stratum+tcp://stratum.mine-coin.de:3377 -u xxx -p xxxx -d 0 -d 1 -w 256 -g 2 -I 13 --lookup-gap 2,2 --thread-concurrency 8192,8192 --gpu-engine 1080,1080 --gpu-memclock 1500,1500 --gpu-powertune -20,-20
looks fine whats not working for you ?
only thing i can see is you only using 2 of the 4
with the -d command
