I.M.O.G. writes: "Today AMD officially introduces their newest flagship GPU, the Radeon HD 6990. Targeted to counter Nvidia's current generation flagship GTX580, for AMD this is a followup to their previous generation 2xGPU on a single PCB design, the Radeon HD 5970. It represents the strongest entry AMD will release within their 6000 series graphics lineup. Initial testing and overclocking results are publishing at first tier review sites now. As eloquently stated by Tweaktown's Anthony Garreffa, the 6990 "punches all other GPU's in the nuts.""