Lawrence Livermore NL Lassen Phase 1 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 2018. At that moment it ranked number 8 among known clusters.
It is built on 2,736 NVIDIA V100. That amounts to about 173 H100e of AI compute. The cluster draws roughly 1.88 MW. Its hardware is estimated at $54M.
Epoch AI rates the certainty of this record as confirmed.