My configs for three(3) different cards.
7950 card(s): [1.8mh][60-70C at 50% fan.]sgminer.exe -k darkcoin -g 2 --thread-concurrency 8192 --gpu-memclock 1375 --gpu-engine 1080 --gpu-powertune d --auto-fan --gpu-fan 50-100 --temp-overheat 75 --temp-cutoff 85 --intensity 13
280x DC2T card(s): [2.26mh][60-70C at 50% fan.]sgminer.exe -k darkcoin -g 2 --thread-concurrency 8192 --gpu-memclock 1600 --gpu-engine 1150 --gpu-powertune d --auto-fan --gpu-fan 50-100 --temp-overheat 75 --temp-cutoff 85 --intensity 13
280x Toxic card(s): [2.38mh][60-70C at 50% fan.]sgminer.exe -k darkcoin -g 2 --thread-concurrency 8192 --gpu-memclock 1800 --gpu-engine 1200 --gpu-powertune d --auto-fan --gpu-fan 50-100 --temp-overheat 75 --temp-cutoff 85 --intensity 13
These specs are working good for me. Hope they will perform just as good for the next person should someone try.