Supercomputers/Systems/JUWELS Booster
Germany · operational · mixed
JUWELS Booster
Operated by Forschungszentrum Julich at Julich Supercomputing Centre .
Phase 1 seed dataset, compiled by hand. These rows were built from public operator, laboratory and vendor sources. A mechanical second-reader pass has since fetched every cited source: 32 of 52 systems have a readable citation that names them, and 4 are genuinely weakly sourced. Every claim carries its source and a confidence tier. Treat anything below verified as a lead, not a citation.
Measured performance
- Rmax
- 44.12 PFlop/s
- Rpeak
- 70.98 PFlop/s
- Rmax ÷ Rpeak
- 62.2%
- Cores
- 449,280
- Power
- 1.76 MW
- Per watt
- 25.0 GF/W
Figures are as last publicly reported for the configuration described below, not a live measurement. Where a system was upgraded in place, the post-upgrade configuration is shown and the earlier one appears in the timeline.
What this machine is made of
One row per supplier relationship. “Supplier at build” is the company that shipped the part at the time; where that company has since been acquired, the parent it rolls up to today is shown beside it. That distinction is what makes ticker-level aggregation possible across a thirty-year dataset.
| Role | Part | Supplier at build | Quantity | Confidence | Source |
|---|---|---|---|---|---|
| Integrator | - Atos BullSequana XH2000 | Eviden | - | Reported | fz-juelich.deeurohpc-ju.europa.eu |
| Accelerator | NVIDIA A100 SXM4 40GB Accelerators NVIDIA A100 SXM4 40 GB | NVIDIA | - | Reported | fz-juelich.deeurohpc-ju.europa.eu |
| CPU | AMD EPYC 7402 (Rome) CPUs AMD EPYC 7402 24C 2.8GHz | AMD | - | Reported | fz-juelich.deeurohpc-ju.europa.eu |
| Interconnect | NVIDIA InfiniBand HDR Interconnect Mellanox HDR Infiniband | NVIDIA | - | Reported | fz-juelich.deeurohpc-ju.europa.eu |
| Cooling | Direct liquid cooling, warm water Cooling BullSequana XH2000: direct liquid cooled platform | Eviden | - | Reported | fz-juelich.deeurohpc-ju.europa.eu |
The read
The first European system past 40 petaflops, and the machine that established the Atos-plus-AMD-plus-NVIDIA pattern that MareNostrum 5 and JUPITER later repeated. Its supplier at build was Atos; the same business is Eviden today, which is why this row and the Leonardo row need the alias table to aggregate correctly.
Timeline
- 2019 Announced source
- 2020-11 List debut at #7 (November 2020) source
- 2020-11 First operational source
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Site & facility
Julich Supercomputing Centre
- Location
- Julich, Germany
- Cooling
- Direct liquid cooling
- Commissioned
- 2004
Source check
We fetched this system's own citations and recorded whether each page actually mentions it. This is a corroboration signal, not a fact check, and it is published so you can see how well the sourcing holds up rather than take it on trust.
One cited source was readable and does not mention this system; another could not be read because the host returned a bot challenge. The unreadable one may well be fine, so this is weaker evidence than a corroborated row and much stronger than an unsupported one. See how this check works.
| Cited source | Result | Found on the page |
|---|---|---|
| eurohpc-ju.europa.eu | does not name this system | - |
| fz-juelich.de | blocked our fetch | - |
Checked 2026-09-08 by pnpm verify. Re-run it and the table changes with the web.
Further reading
Inside a node
Why accelerators exist, what the memory hierarchy costs, and how the CPU and accelerator merged onto one package.
Power and cooling
Why air ran out at 20 kW a rack, how warm-water cooling removes the chillers, and what PUE conceals.
Operating a supercomputer
Acceptance testing, why "installed" and "in production" are six months apart, and the machine lifecycle.