Helios (IFERC)

Also known as IFERC-CSC Helios

Operated by IFERC-CSC at IFERC Computer Simulation Centre (Rokkasho) .

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: 1092 of 1153 systems have a readable citation that names them, and 40 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: 1.24 PFlop/s
Rpeak: 1.52 PFlop/s
Rmax ÷ Rpeak: 81.2%
Cores: 70,560
Power: 2.20 MW
Per watt: 0.6 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	- Bull bullx B510 cluster	Bull ATOEPA rolls up to Atos	-	Reported	top500.org fusionforenergy.europa.eu
CPU	Intel Xeon E5-2680 CPUs x86-64 · 8C · 2.7 GHz · 32 nm · 130 W Intel Xeon E5-2680 8C 2.7GHz	Intel INTCNASDAQ	-	Reported	top500.org
Interconnect	Mellanox InfiniBand QDR Interconnect Fat tree · 40 Gb/s per 4x port InfiniBand QDR	Mellanox NVDANASDAQ rolls up to NVIDIA	-	Reported	top500.org

The read

A Bull bullx B510 cluster of Intel Xeon E5-2680 processors over InfiniBand QDR, supplied by France (through CEA) as its contribution to the EU-Japan Broader Approach fusion agreement and installed at the International Fusion Energy Research Centre in Rokkasho, Japan. TOP500 lists 70,560 cores, 1.237 PFlop/s Rmax, 1.524 PFlop/s Rpeak and 2,200 kW, and it peaked at 12th place on the June 2012 list. Fusion for Energy states the machine ran from 2012 to 2016, above 98 percent utilisation in a typical week, supporting 639 peer-reviewed papers, and that Europe's successor capacity went to the Marconi system managed by EUROfusion. Acceptance tests ran in December 2011 and the machine was inaugurated in March 2012, so the start date here is recorded only as 2012. A smaller Bull B515 system also named HELIOS (24,480 cores with Xeon Phi, 0.225 PFlop/s Rmax) appears on TOP500 from 2014 as an extension and is not counted in the figures on this row. TOP500 is the only source for the Rmax, Rpeak and core figures, so the tier is reported.

Timeline

2012 First operational source
2012-06 List debut at #12 (June 2012) source
2016-12 Decommissioned source

Public list appearances

Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.

#12: TOP500, June 2012 →

Site & facility

IFERC Computer Simulation Centre (Rokkasho)

Location: Rokkasho, Aomori, Japan
Commissioned: 2012

iter.org fusionforenergy.europa.eu

Change history

2026-10-01 Added Helios (IFERC)

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.

Cited source	Result	Found on the page
fusionforenergy.europa.eu	names system only	-
top500.org	names system and part	Intel Xeon E5-2680, Mellanox InfiniBand QDR

Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.