I don't think you grasp exactly what may be the issue here. In the case of the 3900x and 3950x, the two-chiplet solutions simply doubled the memory write speed of the CPU vs. single-chiplet Matisse running the same memory speed/timings.
Have you ever stopped to wonder why the memory controller on Matisse works that way? What if the memory controller on Renoir doesn't work that way?
It's 4 or 8, 6 would be a major revamp.Since its a redesign of the layout, if anything I expect them to have a 6 or 8 core monolithic die.
But why don't they pick the Raven Ridge design remove the cpu cores from it and add one or two chiplets to it, wouldn't that be great for desktop/oems market at least, even if mobile not much?
It would not even compete with the others (3200G/3500G) already in the market.