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ATI on Thursday will announce three new graphics chips that will extend the performance lead the company established with the Radeon 9700. The Radeon 9800, set to go on sale later this month in graphics cards priced around $400, will operate at speeds of 380MHz and 340MHz, compared with 325MHz and 310MHz for the 9700, said David Rolston, vice president of engineering for ATI. The chips will also have dramatically enhanced support for shader instructions, pixel-by-pixel graphics programming that can dramatically increase the realism of animated images.