Introduction
On 10 June 2025, the TOP500 supercomputer rankings—one of the most authoritative global measures of high-performance computing—released its June list.
The headline: JUPITER, located at the Forschungszentrum Jülich, is now officially the fastest supercomputer in Europe.
EuroHPC JU announcement
Key Facts About JUPITER
- JUPITER ranks #4 globally in the June 2025 TOP500 list.
TOP500 June 2025 list - It is the fastest supercomputer in Europe as of that ranking.
EuroHPC JU - JUPITER is part of the EuroHPC Joint Undertaking, hosted at the Jülich Supercomputing Centre (Germany).
FZ Jülich – JUPITER info page - The system uses a booster partition (supplied by Eviden), featuring ~24,000 NVIDIA GH200 Grace Hopper Superchips.
FZ Jülich press release - It also leads among Europe’s supercomputers in energy efficiency, compared to the other top 5 machines globally.
EuroHPC JU
Implications & Significance
- For research, climate modelling, AI training, and scientific simulation, Europe now has a supercomputer that brings exascale-capable performance (or close) into reach.
- Energy efficiency is increasingly important; JUPITER’s performance per watt shows Europe’s push toward sustainable HPC.
- As the fastest in Europe, JUPITER strengthens scientific sovereignty—reducing reliance on computing infrastructure outside Europe.
- It enables larger AI models, more ambitious simulations in physics, biology, climate science, etc., to be run domestically.
Challenges & Open Questions
- Full operational capacity: While the booster partition is installed and partially operational, some parts are still in early access/tuning.
- Access & allocation: Researchers will need fair access to time on JUPITER; smaller institutions must also benefit.
- Energy & cooling demands: Even with efficiency gains, exascale systems consume massive power and require advanced cooling.
- Software ecosystem: Optimizing codes, parallelization, and fault tolerance to fully leverage JUPITER will take time.
Conclusion
With the June 2025 TOP500 rankings, JUPITER has officially claimed the title of Europe’s fastest supercomputer, placing #4 globally.
The milestone shows Europe’s growing HPC capability, combining high peak performance with strong efficiency.
As the system advances into full operation, its impact on AI, science, and innovation across Europe could be profound.
Sources
- EuroHPC JU – EuroHPC Supercomputers Put Europe at the Forefront of Global Supercomputing (10 June 2025)
Link - Forschungszentrum Jülich – JUPITER Supercomputer Propels European Computing Power (Press release, 10 June 2025)
Link - TOP500 – June 2025 List: JUPITER at #4 globally, #1 in Europe
Link - IEEE Spectrum – Europe’s First Exascale Supercomputer Powers Up
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