I have to second this question. There are numerous posts stating that Crossfire/SLI is NOT supported in OS-X, but the guide still states that multiple NVidia cards running in "tandem" is now possible. "Running in tandem" by any definition is SLI. So, is it somehow supported with a method that I'm not aware of? Or as the guide says, "dual and triple cards are enabled by default", is it just a matter of installing any GTX card that is GTX 770 or lower and OS-X will take care of the rest?
Please, if Tonymacx86 or one of the moderators could just give a definitive answer to this question, that would be very appreciated.