12.5 percent more shader power should be possible with the RV770 if AMD activates the additional 100 stream processors which the GPU is supposed to have.
900 stream processors are supposed to be seen on this GPU picture.
Nvidia had to modify its GT200 chip in order to defy AMD's fast RV770. If the image material from the Xtremesystems forum is correct, AMD might have less work with improving the performance of the RV770.
The RV770 is supposed to have 900 stream processors of which only 800 are currently activated . The RV770 would theoretically improve its shader performance by 12.5 percent with the additional 100 stream processors.
According to Hardware-Infos the additional ALUs are only used due to redundancy reasons. Technically the activation of the 100 shaders would not provide any advantages in practice except for GPGPU computing. It is nothing new that AMD installs more stream processors than actually needed since chip defects can be compensated very fast. The chips on which all stream processors are working can also be sold as upgraded models.