I just got hold of one of these cards yesterday and wish to make sure i've got it all setup right.

Im currently using the latest beta drivers (93.81) from Nvidia and within the control panel there is a option for the Multi-GPU setting.

You can set it to Force 1, Force 2, Split and Single GPU

Which is the best setting for making sure the card is always run in SLI mode for all games.

I mainly play CS:Source which i don't believe supports SLI properly