We have a handful of 5,1s here in a post-production environment. We're currently a FCP6 house, but will be transitioning to Adobe CC. Basically, FCP6 still needs to function for a while to open up previous projects. My plan was to get new SSDs and load Mountain Lion on them and install a GTX680 for CUDA, while keeping the old HDD with Snow Leopard and FCP6 and boot into it when the need arrises. So FCP6 needs Snow Leopard, but Adobe CC with GTX needs Mountain Lion. Ideally, with both the ATI 5770 and GTX680 in the machine I could boot into either drive no problem. However, this would require 3 6-pin power connectors when the 5,1s only have 2. I guess I could open up the machine and switch cards when I need one OS or the other, but I'd like to avoid that if possible. Is it possible to run both of these cards together in a 5,1? Or can you think of a different way to boot both Snow Leopard and ML with GTX in the same machine? Thanks for any suggestions.