Where would you route the connection to the additional 4 groups of chips around the die? The PCIe connection needs to be there too, and they also may not like power delivery going through them
Nvidia has done a 512-bit bus in the past. The 3090 has 4 groups of 3 on each side of the card. Switching to 4 groups of 4 should be doable visually. That said, I would not want to be the one responsible for doing the trace routing.
