Japan · operational · mixed

Fugaku

Operated by RIKEN at RIKEN Center for Computational Science.

Phase 1 seed dataset — under review. These rows were compiled by hand from public operator, laboratory and vendor sources, and have not yet been through a second-reader verification pass. Every claim carries its source and a confidence tier; treat anything below verified as a lead, not a citation.

Measured performance

Rmax: 442.0 PFlop/s
Rpeak: 537.2 PFlop/s
Rmax ÷ Rpeak: 82.3%
Cores: 7,630,848
Power: 29.90 MW
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	Fujitsu 6702TSE	—	Verified	r-ccs.riken.jp global.fujitsu
CPU	Fujitsu A64FX CPUs A64FX 48C 2.2GHz	Fujitsu 6702TSE	158,976 reported	Verified	r-ccs.riken.jp global.fujitsu
Interconnect	Fujitsu Tofu Interconnect D Interconnect Tofu interconnect D	Fujitsu 6702TSE	—	Verified	r-ccs.riken.jp global.fujitsu
Cooling	Direct liquid cooling, warm water Cooling direct water cooling	Fujitsu 6702TSE	—	Reported	r-ccs.riken.jp global.fujitsu

The read

158,976 A64FX nodes, no accelerators, no separate NIC — the Tofu D interconnect is on the CPU package. The shortest bill of materials of any modern leadership system: one company supplies the processor, the memory interface, the fabric and the integration. It is the counterexample to the assumption that top-end compute necessarily implies a multi-vendor supply chain, and the reason our accelerator-share chart has to handle a null accelerator role rather than treating every system as heterogeneous.

Timeline

2014 Announced source
2020-06 List debut at #1 (June 2020) source
2020-06 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.

#1 — TOP500, June 2020 →

Site & facility

RIKEN Center for Computational Science

Location: Kobe, Japan
Cooling: Direct liquid cooling (warm water)
Commissioned: 2010

r-ccs.riken.jp