I used to only recommend single cards as I have had so many issues with multi gpu set ups in the past BUT, Nvidia has fixed the issues I had. I haven't had a single problem with any games and I have played most of the new games out there. For the money, this set up cannot be beat. By the way, I am running them along with a 3770k@4.5ghz, 3 SSDs, 1 HD, 32GB of memory, etc. off of a 620w Seasonic. The newer cards are so energy efficient.