setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
sgminer -k groestlcoin -o stratum+tcp://erebor.dwarfpool.com:3345 -u  -p  -I 20 -g 1 -w 256 --thread-concurrency 8192 --gpu-powertune 20 --temp-overheat 85

7970 Gigabyte 7970 GV-R797OC-3GD        6300+
280x asus     6300+

default voltage both

with I-24 they are mining bit more,but I was too lazy to test them more.....


edit:core clock 1090
      mem clock 1500    both