AMD announced its RV620, RV635 and R680 will all be available in January 2008:
Representatives from AMD would not confirm that the R680 is essentially two RV670 GPU cores on the same board, though the company did confirm that each core has the same specifications of an RV670 processor.
The RV670 graphics core, announced last November with the Phenom processor, is the first 55nm desktop graphics adaptor. AMD does not target this card as a high-end adaptor, though reviewers were quick to herald the RV670 as AMD's best product of 2007.
The company also made quick mention of the RV620 and RV635 GPU cores. These cores are nearly identical to the previous RV610 and RV630 processors, but will be produced on the 55nm node instead.