JMA PRIMEHPC FX1000

Operated by Japan Meteorological Agency at Japan Meteorological Agency (Tokyo) .

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: 13.37 PFlop/s
Rpeak: 15.57 PFlop/s
Rmax ÷ Rpeak: 85.9%
Cores: 221,184
Power: 904.72 kW
Per watt: 14.8 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	- Fujitsu PRIMEHPC FX1000	Fujitsu 6702TSE	-	Verified	info.archives.global.fujitsu top500.org
CPU	Fujitsu A64FX CPUs Armv8.2-A SVE · 48C · 2.2 GHz · 7 nm A64FX 48C 2.2GHz	Fujitsu 6702TSE	-	Verified	top500.org info.archives.global.fujitsu
Interconnect	Fujitsu Tofu Interconnect D Interconnect 6D mesh/torus · 6.8 GB/s per link per direction Tofu interconnect D	Fujitsu 6702TSE	-	Verified	top500.org info.archives.global.fujitsu

The read

The Japan Meteorological Agency's Fujitsu system, a PRIMEHPC FX1000 built on the same A64FX processor as Fugaku over a Tofu interconnect D fabric, arranged as 24 racks split evenly between a main and a sub system for resilience. Fujitsu's own release states the combined theoretical peak as about 31.1 PFlop/s and that operations began on 1 March 2023; TOP500 lists the two halves as separate entries; this row is the higher-ranked of the two. Fujitsu states the system's purpose as improving prediction of the linear rainbands that can trigger torrential rain, landslides and flooding. TOP500 is the only source for Rmax, Rpeak and core count, so the tier is reported.

Timeline

2023-03 First operational source
2023-06 List debut at #51 (June 2023) source

Public list appearances

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

#51: TOP500, June 2023 →

Site & facility

Japan Meteorological Agency (Tokyo)

Location: Tokyo, Japan
Commissioned: 2022

top500.org info.archives.global.fujitsu

Change history

2026-09-24 Added with a rank pointer on the edition where it ranked highest

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
info.archives.global.fujitsu	names system and part	Fujitsu A64FX
top500.org	names system and part	Fujitsu A64FX, Fujitsu Tofu Interconnect D

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