Eni HPC4 Phase 1 is a large GPU cluster operated by Eni, located in Italy, in the private sector. It came online around January 2018. At that moment it ranked number 8 among known clusters.
It is built on 3,170 NVIDIA P100. That amounts to about 29.95 H100e of AI compute. The cluster draws roughly 2.48 MW.
Epoch AI rates the certainty of this record as confirmed.