THE INTRODUCTION OF ATI's Radeon X800 series completed a one-two punch of killer developments for graphics chips, as ATI countered NVIDIA's GeForce 6800 with its own 16-pipe monster capable of astonishing performance. These new chips are very evenly matched in terms of performance, so we've interrogated ATI's David Nalasco about places where they differ: shader models, OpenGL performance, antialiasing methods, and the cards themselves. We've also discussed some of the questions raised by the controversial discovery of ATI's adaptive trilinear filtering algorithm. Read on for an in-depth discussion about the hottest graphics issues of the day.