The Inquirer reports ATI is preparing the RD580 chipset. This will be an upgraded RD480 with more PCI Express lanes to counter NVIDIA's C8K04 chipset that features two x16 PCI Express slots.
ATI is lagging with its chipsets but Nvidia is playing with dual cards a little bit more than ATI. RD580 is the name of the north bridge while this chipset can be used with ATI's RS450 Southbridge. We are sure you will be able to use ULI chipsets as well.
ATI won't need interconnecting between two cards as soon as those motherboards are available so it will be a big step for the firm. We still need to play with RD480 first to see how ATI did its homework with dual graphic capable chipsets but the company was working hard on it.
Motherboards based on this chipset will likely appear in January 2006.