http://widescreengamingforum.com/news/amd-releases-catalyst-1110-w-big-eyefinity-updates
This is the first WHQL release driver to incorporate 5x1 Eyefinity support. Additionally, res support has increased from 8k to 16k. Previously the 8k pixel limitation (that we all believed to be a Windows limitation) meant that 5x1-Landscape Eyefinity couldn't go beyond 1600x900x5. Even 1680x1050x5 was out due to the hard 8,000 pixel limit. This new feature means that even 2560x1600x5-L is possible (if you've got the horsepower for it).
;)
LoPiO