NVIDIA SATURN V Phase 1 is a large GPU cluster operated by NVIDIA, located in the United States, in the private sector. It came online around November 2016. At that moment it ranked number 6 among known clusters.
It is built on 992 NVIDIA P100. That amounts to about 9.37 H100e of AI compute. The cluster draws roughly 0.59 MW. Its hardware is estimated at $123M.
Epoch AI rates the certainty of this record as confirmed.