AMD's major video chipset update this fall has had its feature set and release date uncovered thanks to a slip of information Monday. The ATI Radeon HD 5800 series should be fronted by the 5850 and 5870, both high-end cards that could be the first to support Eyefinity, a technology that not unlike Matrox cards will support three displays on a single card. They are also to be AMD's first graphics