Argonne NL Polaris is a large GPU cluster operated by US Department of Energy, located in the United States, in the public sector. It came online around November 2021. At that moment it ranked number 13 among known clusters.
It is built on 2,240 NVIDIA A100. That amounts to about 706 H100e of AI compute. The cluster draws roughly 1.92 MW. Its hardware is estimated at $76M.
Epoch AI rates the certainty of this record as confirmed.