Dual Video Cards?

[Tarloque]

In the options section there is a setting for enabling dual video cards. (I run with a triple monitor set up)

When I enable this option nothing seems to happen.
What exactly does this do and why am I not seeing anything?

thanks!

[venny]

i thought u only turn on that option if u have 2 video cards running SLI or Crossfire?...

[wenZECA]

this is why games SHOULD REALLY COME WITH A MANUAL

[venny]

well, thats y there is US! the l33tforumgamingdictionary!!!

[AllFoamNoBeer]

You should have 2 video cards in either SLi or Crossfire.

I am presuming you should, afterall, you have 3 monitors..