The question of performance as a function of computing power is an interesting one. Demis Hassabis claims that the returns are diminishing quickly when going above the system they are using. In fact Alpha Go Ke Ji uses 10 times less power than Alpha Go Lee Sedol, though the architecture has changed to using Google's own TPUs, so it's not an easy comparison.

In either case Alpha Go Ke Ji is said to be 3 stones stronger than Alpha Go Lee Sedol which the team claims comes nearly completely from algorithm improvements.