While there can be microstutter with AFR, that is the method that nvidia uses for SLI rendering no matter what you do, though there are some games that could use the older SFR but not many. SLI as used by Nvidia has nothing to do with Scan Line Interleave rendering other than the fact that Nvidia bought the rights to use the name from 3dfx when they went bankrupt. SLI currently means Scalable Link Interface when talking about Nvidia SLI.
http://en.wikipedia.org/wiki/Scalable_Link_Interface
http://en.wikipedia.org/wiki/Scan-Line_Interleave
I can see the same thing in Coldharbour. With SLI on + fix I saw 40 fps in some areas of Coldharbour, with SLI off - 50 fps there.My fps was always decent with one card but got fps drops with 2 (GTX 680s)
Tried this fix a few mins ago, and it worked. My fps is almost double. I used to get 60fps but it was less stable than nowthanks a lot OP