Hunter Places in Top 3% for Energy Efficiency among World’s Fastest Supercomputers

HLRS’s flagship high-performance computing system was ranked 12th in the June 2025 Green500 List.

One of the most anticipated events at each year’s ISC High Performance convention is the announcement of the latest TOP500 and Green500 Lists. Released twice annually, the TOP500 and Green500 Lists rate the world’s highest performing supercomputers in terms of top speed and energy efficiency, respectively.

In its June 2025 inaugural appearance in the Green500 List, the Hunter supercomputer at the High-Performance Computing Center Stuttgart (HLRS) was ranked 12^th. (It was also ranked 53^rd for overall peak performance in the TOP500 List.) The Green500 List ranks all Top500 systems based on their HPL benchmark performance per Watt of energy consumed. Hunter achieved an energy performance of 64.653 Gigaflops per Watt.

Published

Jun 10, 2025

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Based on the HPE Cray EX4000 platform from Hewlett Packard Enterprise, Hunter was inaugurated and went into service in early 2025. Its theoretical peak performance of 48.1 Petaflops is enabled by AMD Instinct MI300A accelerated processing units. It also uses 100% fanless direct liquid cooling system architecture developed at HPE and is implementing a dynamic power capping method to maximize its energy performance. At nearly double the speed of its predecessor, Hawk, Hunter uses 80% less energy at peak performance.

Sustainability and energy efficiency have long been central components of HLRS’s strategy. It remains the only HPC center of its size to be certified by the Eco-Management and Audit Scheme, the world’s most demanding standard for environmental performance. Planning for Herder and a new building called HLRS III are also being done with sustainability in mind, including building new infrastructure to reuse heat generated by Herder in buildings on the University of Stuttgart campus.

— Christopher Williams

Funding for Hunter is provided by the Baden-Württemberg Ministry for Science, Research, and the Arts and the German Federal Ministry of Research, Technology and Space through the Gauss Centre for Supercomputing (GCS).