I'm going to be building a new PC and I kinda wanna go all out on it. I've seen this monstrous ASUS Mars II, but from further research it's running 580s in SLI. Considering it's a heck of a lot more expensive than buying two separate cards, my question is, is there anything more to it than that? For example , if I chose to just buy two 580s and run them in SLI, will I get about the same performance? Or did they soup it up in some other way.