It doesn't matter if it is a single "card" solution what is important is if it is a single "chip" solution. Having owned both 280 GTX SLi and 4870 Crossfire from this generation, I am still not very impressed with either multi-gpu solution. With the 4870x2 ATi still has not changed the way that multi-gpu solutions work. Until ATI or nVidia fundamentally change the way multi-gpu on a single card works, whether it is "single card" or not is just symantecs.
Originally Posted by Xion X2
Even Nvidia refers to the 4870X2 as a single card:
Seems pretty evident to them that it's a "real" single card solution. Considering it also runs on a single PCI-E slot, I'd say you're in the minority here and need to go back and consult Plato again.