New BETA Driver does nothing for MW3 - but MW3 does support and use SLI. Go get MSI Afterburner and set it up. Its free. If you have looked at many of my screenshots I have GPU info in the top left corner, this is MSI Afterburner info showing temps, GPU usage, GPU Mem Usage, as well as FPS. I can see when only one card is being used fully or if the VRAM is being used fully, etc.i also noticed that MW3 single player and multiplayer does not support SLI...i don't have that graph/bar on the left side of my screen while playing..kinda suxx.
I also noticed that the new Beta drivers doesn't do anything for MW3..grrr.