It has been quite a while since AMD launched a new high-end desktop chipset. The 790FX has been riding high at the top of AMD's line-up for over two years now. It has been paired to newer Southbridge chips and AMD did follow up with the 790GX about a year and half ago, but for all intents and purposes AMD's flagship desktop chipset has remained unchanged for what is equivalent to an eternity in Internet-years.
Today, however, a new chipset will finally supplant the 790FX/GX at the top of AMD's line-up. As its name suggests, the 890GX features an integrated graphics core, but there's more to the story than just graphics. AMD has specifically stated that the 890GX will officially support upcoming 6-Core Phenom II X6 processors, and courtesy of a new Southbridge, the SB850, the AMD 890GX is the first core logic chipset to natively support SATA 6G.
http://hothardware.com/Articles/AMD-890 ... set-Debut/
AMD's 890GX Chipset - Same Graphics, Better South Bridge :-
http://www.anandtech.com/printarticle.aspx?i=3755
