Ran across this today. Thought I'd share.
Oct 17, 2011
Multiple Video Cards
Almost nobody should do what I am about to describe – that is, install and use more than one video card. Nobody really needs that much graphics performance. It's also technically complex and a little expensive. But sometimes you gotta say to hell with rationality and embrace the overkill.
Why? Battlefield 3, that's why.
http://www.codinghorror.com/blog/2011/1 ... cards.html