I remember reading Nikon saying they already pushed the E6’s to their limits.Twin expeed processors COULD mean that image processing is split between them and each one handles every other frame. At half the resolution of a Z8/Z9 I would expect it to nearly quadruple the frame rate. I suspect this may be capable of 120fps Raw. Also Id bet its gen 4.0 PCIE. We are getting gen 4 cards now so a gen 4 camera is very close to being released.
Another possibility is that the 2nd processor will allow dual writing for video.
OR the second expeed is there to only handle AF and viewfinder duties and will provide a minor bump in performance.
If they could get Z8/9 AF into it, they could update the current Z6/7ii
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