According to our associate, for the following high end AMD graphic processor remained in all just more than half year - In Q1 2009 AMD company plan to present its solutions on base of R780 GPU , in this case AMD will use 40- nm (according to some data - 45- nm) technological standards.
In this case, AMD will test the new technical process on the simpler RV740 core, which will pass to the new standards earlier. The most important information is the quantity of stream processors in R870 chip . Associate speaks about 2000 (!), this is a lot in comparison with the 800 used in present generation, rv770.
However, if we assume that R870 is the code name of two-processor card, then this become more logical.