That's Carmarck's ideal he's talking about, not his realistic view of the current/future situation about which Sweeny is talking. It was John Carmack who said they'd base their development environment on Xbox 360 2 years ago after all.Just a thought, I consider Carmack a genius based on my terminology -thereby lumping him with the likes of Bell, Newton, Galileo, and Einstein in the gaming world- and he, unlike Sweeney, believes Crossfire and SLI are good for the developers, so Sweeney is probably wrong.