The Radeon 9800 XT is based on ATI's R360 chip, which is essentially a minor revision of the R350 chip used in the Radeon 9800 Pro. The chip is still fabbed by TMSC using 0.15-micron process technology. ATI has modified R360 silicon in order to clean up some trouble areas and to allow for higher clock speeds. Beyond that, the R360 has all the familiar R350 features, including support for floating-point pixel formats, programmable shaders, and F-buffer logic that enables longer shader programs without conventional multipass rendering. With the tweaks, the Radeon 9800 XT has reached new highs: a 412MHz core clock speed with an effective 730MHz clock speed on its DDR memory. That's just a step or two up from the 380/700MHz core and memory speeds of the 9800 Pro 256MB.