In second position in energy efficiency is a new NVIDIA Selene supercomputer, a DGX A100 SuperPOD powered by the new A100 GPUs. This ranks at seven on the TOP500 for performance.
The Fugaku supercomputer is ninth in the power efficiency, with 14.67 gigaflops per watt. Perhaps surprisingly given the use of the ARM cores, it is just behind the IBM Power-based Summit in power efficiency at 14.72 gigaflops/watt. A full report on the Fugaku system by Jack Dongerra of the University of Manchester is at the Fugaku Report
The Top500 list is at www.top500.org