No sure if this is correct but I seem to be getting 180 Mh/s with 7950s (nix, 14.6 drivers) but the watts and heat are just about the same as mining scrypt. my settings are
./cgminer --skein -I 8 --gpu-threads 2 -w 64 --thread-concurrency 8192 --gpu-engine 1050 --gpu-memclock 800 --auto-fan --temp-cutoff 85 --temp-target 71,70,71
any feedback would be helpful, or should i try myriad-groestl instead?