Rambus meant Nintendo shipped 5 gen console on 2 layer pcb with only 4 big ICs. TWO layers! that was a huge cost saving. Compare to Sega Saturn with a total of something like 144bits of various memory buses divided into multiple memory banks over multiple memory chips.
One was thrown together by committee with some function goal in mind, the other designed top to bottom with huge influence from process engineers. Simplified layout and reducent component count/variety means less time in pick&place, faster optical alignment, faster optical inspection, less opportunity for process flaws.
