I like how on the Nvidia slide they put the X1900XTX at the very bottom. Took me a while to notice it was even thre at first. Wonder if it has anything to do with the fact that it beats the 7900GTX.

I can also guarantee you that the Xfire in that slide is running on an RD480 mobo, with who knows what BIOS. I think a properly tweaked RD580 board would bring those Crossfire and SLI scores much closer.