RV670 is the most controversial chip in ATI’s history. ATI is trying to seduce its partners with some fake news, and legal or not it confuses the market completely.
RV670 is suppose to be the R600 variation with 256 bit memory interface done in 55 nanometre. It will feature 320 stream processors and the PCB will less complex.
DAAMIT also hopes for 800+ MHz clocks and the new chip should have more ROPs but we don’t know exactly how much more. Just to be on the safe side, ATI will call this one a mainstream chip and two of them a high end at least for the time being.