Quote Originally Posted by LordEC911 View Post

GDDR5 is good and ready to go.
RV770 IS a 256bit GPU. Seeing as how they will be using the RV670 PCB with some slight component changes.
What would the problem be then? I can't see the die having issues at this point considering its just an upgraded rv670 as you said and taped out months ago. Gddr5 remains the logical explanation, probably there isn't much volume yet, which is one reason why nvidia went with 512bit for gt200 (also the 32 ROPs remains as a big reason)