MIT LLSC TX-GAIA is a large GPU cluster operated by US Department of Defense, located in the United States, in the public sector. It came online around September 2019. At that moment it ranked number 24 among known clusters.
It is built on 896 NVIDIA V100. That amounts to about 56.59 H100e of AI compute. The cluster draws roughly 2.57 MW. Its hardware is estimated at $17M.
Epoch AI rates the certainty of this record as confirmed.