Anandtech published New #1 Supercomputer: Fujitsu’s Fugaku and A64FX take Arm to the Top with 415 PetaFLOPs A quote from the article:

High performance computing is now at a point in its existence where to be the number one, you need very powerful, very efficient hardware, lots of it, and lots of capability to deploy it. Deploying a single rack of servers to total a couple of thousand cores isn’t going to cut it. The former #1 supercomputer, Summit, is built from 22-core IBM Power9 CPUs paired with NVIDIA GV100 accelerators, totaling 2.4 million cores and consuming 10 MegaWatts of power. The new Fugaku supercomputer, built at Riken in partnership with Fujitsu, takes the top spot on the June 2020 #1 list, with 7.3 million cores and consuming 28 MegaWatts of power.

  New #1 Supercomputer: Fujitsu’s Fugaku and A64FX take Arm to the Top with 415 PetaFLOPs