I see you posting this everywhere and I feel I must address it. I'll try to be quick and easy.
https://www.youtube.com/watch?v=HVYoiibb2ZU
https://www.youtube.com/watch?v=cPUtxxlI5xo
960 and 970 SLI. Getting close to almost double the frames.
https://www.youtube.com/watch?v=XmSq25LcTrM
Here is the 280X CF, comparing a mid-range to the 960, the CF scale is close to double in two games, but the rest the CF scales poorly.
Now for the 295X2, which, we can all agree, is crossfire'd 290X's.
https://www.youtube.com/watch?v=BlCdEK8uQ4U
https://www.youtube.com/watch?v=JEgsG_wl0kc
The 295X2 is losing against 780ti's and 970s.
This is a double whammy, it shows that the 970SLI edges out the AMD GPU(s) and that the CFX scaling is pretty much