Damn, when I first heard about the GeForce 260 and 280 I thought it was checkmate. No one expected much of the new line of Radeons in the first place given ATI’s lackluster offerings lately, and combine that with the improvement in the 65nm 280 — I think I was justified in thinking so. But the Radeon 4850 came out a little later and jaws dropped. It offered nearly the performance…