In this link 971p doesn't use dithering method but 970p use dithering..
bottom of the page;
What about 971P? Does it use spatial (i.e. standing, not temporal, not FRC) dithering too?
Certainly not. I got photos from two 971P-s that were bought at the end of 2006 in Hungary, and neither did this kind of dithering. But of course, you never know when do they change it, or if they sell this model with different parameters somewhere...