Hello, I was wondering if I should get sli gtx 660s and get a system that is between a 770 and a 780 or should I just upgrade to a 770 for 60 bucks less. If any of you have done this, what do you recommend me doing, is it worth the extra money or not ? Also is it possible to bind a gtx 660 and a 660 superclocked because I have gtx 660sc that isn't on the market any more and has two fans and dual heat sinks but the only ones out there are single fan cards and that wont fit into the config so thats why i'm asking if you can do that.