June 3 2023: The 61st edition of the TOP500 reveals that the Frontier system out of Oak Ridge National Laboratory (ORNL) remains the only true exascale machine on the list. 
Increasing its HPL score from 1.02 Eflop/s in November 2022 to an impressive 1.194 Eflop/s on this list, Frontier was able to improve upon its score after a stagnation between June 2022 and November 2022.
Considering exascale was only a goal to aspire to just a few years ago, a roughly 17% increase here is an enormous success. Additionally, Frontier earned a score of 9.95 Eflop/s on the HLP-MxP benchmark, which measures performance for mixed-precision calculation. This is also an increase over the 7.94 EFlop/s that the system achieved on the previous list and nearly 10 times more powerful than the machine’s HPL score. Frontier is based on the HPE Cray EX235a architecture and utilizes AMD EPYC 64C 2GHz processors. It also has 8,699,904 cores and an incredible energy efficiency rating of 52.59 Gflops/watt.
The Fugaku system at the Riken Center for Computational Science (R-CCS) in Kobe, Japan, also remained at the No. 2 spot that it earned on the previous list. The system held steady at its previous HPL score of 0.442 Eflop/s. 
The LUMI system at EuroHPC/CSC in Finland entered the list in June 2022 at No. 3. It is listed as No. 3 after an upgrade of the system last november and has an HPL score of 0.3091 Eflop/s. With this it remains the largest system in Europe.  
The Leonardo system at EuroHPC/CINECA in Bologna, Italy, remains at the No. 4 spot. It also saw upgrades that allowed it to improve upon its score, achieving an HPL score of 0.239 Eflop/s in comparison to its previous score of 0.174 EFlop/s. 
Summit, an IBM-built system at the Oak Ridge National Laboratory (ORNL) in Tennessee, USA, is again listed at the No. 5 spot worldwide with a performance of 148.8 Pflop/s on the HPL benchmark, which is used to rank the TOP500 list. Summit has 4,356 nodes, each one housing two POWER9 CPUs with 22 cores each and six NVIDIA Tesla V100 GPUs each with 80 streaming multiprocessors (SM). The nodes are linked together with a Mellanox dual-rail EDR InfiniBand network.

The TOP500 list shows that AMD, Intel, and IBM processors are the preferred choice for HPC systems. Out of the TOP10, four systems use AMD processors (Frontier, LUMI, Perlmutter, and Selene), two use Intel processors (Leonardo and Tianhe-2A), and two use IBM processors (Summit and Sierra.) Much like the previous list, China and the United States earned most of the entries on the entire TOP500 list. The United States increased its lead from 126 machines on the last list to 150 on the current list, while China dropped from 162 systems to 134. In terms of entire continents, Asia as a whole saw 192 machines on the list, North America added 160 systems, and Europe offered 133 systems.