CSCS Piz Daint Phase 2 is a large GPU cluster operated by ETH Domain, located in Switzerland, in the public sector. It came online around June 2017. At that moment it ranked number 2 among known clusters.
It is built on 5,704 NVIDIA Tesla P100 PCIe 16GB. That amounts to about 54.91 H100e of AI compute. The cluster draws roughly 4.37 MW. Its hardware is estimated at $121M.
Epoch AI rates the certainty of this record as confirmed.