What does the next great superpower of desktop graphics look like? Well, it shares an unmistakable family resemblance to the current champ, but its dimensions have somehow been made even larger. Yes, we're talking about AMD's Radeon HD 6990 -- a dual-GPU monstrosity that's set to serve as the company's 2011 flagship -- which has just been shown off at an Asia Pacific Fusion Tech Day gathering. Aside from
