... three days later ... Oh, I see: you are wondering why Apple M1 Ultra, as two chips linked by EMIB, couldn't just be the two chips adjacent on the wafer.

... three days later ... Oh, I see: you are wondering why Apple M1 Ultra, as two chips linked by EMIB, couldn't just be the two chips adjacent on the wafer. See the difference? Apple knows what their yields are; if they could be sure to get two matched SoC M1 Max chips right next to one another on the wafer, they could punch that pair out and bypass the whole EMIB thing. I don't know enough about testing and dicing 100-billion-transistor chips to know how expensive that would be.