First Look at the ATi Radeon Express 200P Athlon 64 Chipset (RX480)
 

The RX480 solution works in the same way as most chipsets, with a separated north and south bridge. This means chipset companies can introduce new features by replacing one or the other, without having the redesign the entire silicon.

http://www.spodesabode.com/content/article/rx480


Who would have thought that ATI could get so much right in their first trip to the plate? ATI launches a PCI Express..

http://www.anandtech.com/cpuchipsets...oc.aspx?i=2269

http://www.amdzone.com/modules.php?o...rtid=78&page=1
http://www.legitreviews.com/article.php?aid=117

http://techreport.com/reviews/2004q4...0/index.x?pg=1