GSIC TSUBAME 3.0 is a large GPU cluster operated by Tokyo Institute of Technology, located in Japan, in the public sector. It came online around November 2017. At that moment it ranked number 9 among known clusters.
It is built on 2,156 NVIDIA Tesla P100 SXM2. That amounts to about 23.12 H100e of AI compute. The cluster draws roughly 1.52 MW. Its hardware is estimated at $43M.
Epoch AI rates the certainty of this record as confirmed.