In this light, one of the Taiwanese companies is doing the last touches to X850XT PE cards. The company has the R480, X850 XT PE chips and it is making the cards as we write.Source: The Inquirer
Samples might be ready either by the end of the week, or in the first week of January. The same goes for X800XL cards based on the 110 nanometre R430 based core. Still, this card might easily slide to the middle or to the end of January we are told. It's new architecture, and a new core so it might come a bit later.
ATI X850, X800XL chips to be available in weeks

The Inquirer reports that ATI's X850 and X800XL chips will be available soon.