ATI RV770 to be 1.5 times faster than RV670
 

In the real world, this should mean that if one game gives 50FPS with RV670 that the new chip should be able to get you around 75FPS at the same settings. On average, the new chip will have to be at least 30 percent faster than the old one to make you even consider it but at least specification wise there is not anything that you might miss.

http://www.fudzilla.com/index.php?op...80&Ite mid=34