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The Radeon X1800 will feature sixteen pixel shaders, eight vertex shaders, sixteen texture units, will be able to render sixteen back ends, sixteen Z compare units and will be limited to 512 treads.
The Radeon X1600 features sixteen pixel shaders, five vertex shaders, four texture units, will render four back ends, eight Z compare units and will be limited to 128 threads.
Then there's also the Radeon X1300 which will have four pixel shaders, two vertex shaders, four texture units, render four back ends, four Z compare units and will be limited to 128 threads.
Source: The Inquirer.