One of my general annoyances with ATI is with their reluctance to have a default design structure with twin DVI ports, commonplace with the top of the range Nvidia 6800's. The R3xx and R4xx chips have a VGA, DVO (digital video out) and a TMDS out (DVI, single TMDS). To get dual DVI you need to get a DVO - TMDS convertor chip, ATI currently do this on their high end Firegl boards but to keep costs down on their boards they dont use the extra chip.

The AX800XT goes all the way and includes this additional chip for dual DVI, those of you on dual TFT will appreciate this extra as the video signal out from a standard VGA gives inferior overall image quality.