AlphaGo Master, the much stronger[1] one that beat Ke Jie a year later in 2017, ran on a single 4x TPU (v2?) workstation. [1] From wikipedia, citing deepmind's

AlphaGo Master, the much stronger[1] one that beat Ke Jie a year later in 2017, ran on a single 4x TPU (v2?) workstation. [1] From wikipedia, citing deepmind's paper: 4858 Elo vs 3739 Elo