it does, i use it with SLi enabled and get 99% on both cards
you can tell the difference because 1 its much sharper 2 afterburner text goes a lot smaller
tested with Black flag,Dota2,Grid
so when click your res in GFE at the top it does not give you a high res than your monitor?
the only game that auto does in by default in my libary is Dota2 the rest i have to click the resolution & change it manually
see here Proof, i have 10 minute video with action i was going to put on Youtube if you wish.
https://www.youtube.com/watch?v=PbOjZSbRGxY
Odd it was posted on the overclock.net thread that it doesn't work in SLI but if it's working for you maybe they're wrong.