They've just renamed their mid end part because it performs well enough and the high end is late.
As for the Samaritan demo, clearly they are running it in different settings with further optimizations. Not sure about the 200w PSU part, Mark Rein is renown for getting the facts wrong in statements he makes. He actually said the last time they ran the demo that it was on 3 Geforce ti500's
My guess is that he meant the video card is using 200w or something like that, where as 3 x 580 SLI would be like 700w.