The ATI Radeon X800XT has more software features and software support. With the ATI Radeon X800XT you get ATI's Displays Control Panel and can adjust OpenGL overrides and FSAA options. The ATI Display Control panel will also allow for rotation of the display from landscape to portrait. The overclocking utility will probably also be updated for the Radeon X800XT if it isn't yet, not that I recommend overclocking.