Japan · decommissioned · hpc

Raijin

Also known as NIFS Plasma Simulator (6th generation)

Operated by NIFS .

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: 7.89 PFlop/s
Rpeak: 10.51 PFlop/s
Rmax ÷ Rpeak: 75.1%
Cores: 34,560
Power: 1.55 MW
Per watt: 5.1 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	- NEC SX-Aurora TSUBASA	NEC 6701TSE	-	Reported	top500.org nsrp.nifs.ac.jp
Accelerator	NEC SX-Aurora TSUBASA Vector Engine Accelerators NEC vector · 8C · 1.6 GHz · 16 nm · 300 W 4,320 SX-Aurora TSUBASA vector engines (Vector Engine Type10AE 8C 1.58GHz)	NEC 6701TSE	4,320 reported	Reported	nsrp.nifs.ac.jp top500.org
Interconnect	NVIDIA InfiniBand HDR Interconnect Fat tree or dragonfly+ · 200 Gb/s per port · About 0.6 microseconds Infiniband HDR200	NVIDIA NVDANASDAQ	-	Reported	top500.org

The read

The sixth-generation Plasma Simulator of Japan's National Institute for Fusion Science, an NEC SX-Aurora TSUBASA vector system with 4,320 vector engines, 202 TB of memory, 10.5 petaflops theoretical performance and 32.1 PB of external storage, used for fusion plasma simulation. TOP500 lists NEC Vector Engine Type10AE 8C 1.58GHz over InfiniBand HDR200 with Rmax 7.89 PFlop/s, Rpeak 10.51 PFlop/s, 34,560 cores and 1,550 kW; it debuted on the November 2020 list at rank 33. NIFS's Raijin page says the system operated from 2020 to 2025 before the seventh-generation system Sohsei replaced it, so the decommissioning year is recorded as 2025 with no month; TOP500 still listed it in June 2025. The Rmax, Rpeak and core count come from TOP500 and the architecture details from NIFS, so the tier is reported.

Timeline

2020 First operational source
2020-11 List debut at #33 (November 2020) source
2025 Decommissioned source

Public list appearances

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

#33: TOP500, November 2020 →

Change history

2026-10-01 Added Raijin (NIFS)

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.

Every source cited on this page was readable, and none of them mentions this system. They are cited at page granularity, normally because no stable deep link could be found. That is a real weakness in this row and it is why the system carries a confidence tier below verified. See how this check works.

Cited source	Result	Found on the page
nsrp.nifs.ac.jp	does not name this system	NEC SX-Aurora TSUBASA Vector Engine · counts: 4320
top500.org	does not name this system	NEC SX-Aurora TSUBASA Vector Engine, NVIDIA InfiniBand HDR

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