SLI is working with just the driver, there is no longer any need for us to set up at profile by ourselves, this was implemented in.. I believe November?

Now, I have found that it does not always work to its fullest. When running without AA it sometimes will run both GPUs at only about 55%. It sounds odd, and well, wrong, but I have done several tests, and though it does not happen every time, it happens enough to be easily reproducible (or it may just be my setup that does this?).

For your setup I would expect the following settings to be optimal

Resolution: 1920x1080
Multisampling: 4xAA
General Drawing: 8
Background Drawing: 3
Shadows: Highest
Ambient Occlusion: Off
Depth of Field: On
Disable Cutscene Effects: Off
Hardware Mouse: On
Texture Quality: High
Texture Filtering: Highest

Play around with the Depth of Field, General Drawing and Background Drawing to fine tune to you specs.