I was at an Nvidia presentation where they made a big deal about just being 'on-silicon' rather than having to go through copper connects (to a bus external to

I was at an Nvidia presentation where they made a big deal about just being 'on-silicon' rather than having to go through copper connects (to a bus external to the chip). Each join, corner, etc adds to capacitance on the wire, which then leads to delays (alternatively power consumption, and heat).