This edition of the GREEN500 saw no changes since November 2024.
JEDI once again claimed the No. 1 spot – JUPITER Exascale Development Instrument, a system from EuroHPC/FZJ in Germany. JEDI repeated its energy efficiency rating from the last list at 72.73 GFlops/Watt while producing an HPL score of 4.5 PFlop/s. JEDI is a BullSequana XH3000 machine with a Grace Hopper Superchip, an NVIDIA GH200 Superchip, Quad-Rail NVIDIA InfiniBand NDR200, and 19,584 total cores.
The ROMEO-2025 system claimed the No. 2 spot on this edition’s GREEN500 at the ROMEO HPC Center in Champagne-Ardenne, France. This system premiered with an energy efficiency rating of 70.91 GFlops/Watt and an HPL benchmark of 9.863 PFlop/s. The architecture is identical to JEDI but is twice as large, resulting in slightly lower energy efficiency.
The No. 3 spot was taken by the Adastra 2 system at the Grand Equipement National de Calcul Intensif - Centre Informatique National de l'Enseignement Suprieur (GENCI-CINES) in France. This is a HPE Cray EX255a system with AMD 4th Gen EPYC 24 core 1.8GHz processors, AMD Instinct MI300A accelerator, and HPE Slingshot interconnect, running RHEL. With 16,128 cores total it achieved 2.529 PFlop/s HPL performance and an efficiency of 69.1 GFlops/Watt.
The El Capitan system and the Frontier system both deserve honorable mentions. El Capitan, with its top-scoring HPL benchmark of 1.742 EFlop/s, managed to secure the No. 26 spot on the GREEN500 with an energy efficiency score of 58.89 GFlops/Watt. Frontier, No. 2 on the TOP500, produced an energy efficiency score of 54.98 GFlops/Watt for this GREEN500 list. Both systems demonstrate that it is possible to achieve immense computational power while also prioritizing energy efficiency
Rmax and Rpeak values are in PFlop/s. For more details about other fields, check the TOP500 description.
Rpeak values are calculated using the advertised clock rate of the CPU. For the efficiency of the systems you should take into account the Turbo CPU clock rate where it applies.