NVIDIA released a quick SLI profile patch, to add support for multiple video cards playing the games ArmA II, and Anno 1404 (Dawn of Discovery).
You can download the patch here. In order for it to work, you need to be using Forceware drivers v186.18.
While a second video card probably isn't that necessary to keep things moving in the highly-rated trade and colony sim Anno 1404, ArmA II is a different story. According to user reports, the battlefield simulator FPS is extremely demanding on your hardware, perhaps even worthy of being known as the 'new Crysis.'
