i have a rig with 6 cards 7950 and sgminer not changing gpu-engine to all ,only 4, why?
Don't know, but if you try it so (please change frequency for your gpus):
"gpu-engine" : "1040,1040,1040,1040,1040,1040",
a new version based on the latest sgminer5 version is coming, these problems should be fixed (can't test it though, I have only one amd card)