Speed of signal propagation though wires on modern chips is much slower than the speed of light. A bit less so on an old Xbox chips, but still a big difference.

Speed of signal propagation though wires on modern chips is much slower than the speed of light. A bit less so on an old Xbox chips, but still a big difference. On a modern core the delay is enough that you can't come close to reaching from side one side of a core (not to mention CPU) to another in a single cycle.