KEK VPP500/80

Also known as VPP500/80

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: 98.9 GFlop/s
Rpeak: 128.0 GFlop/s
Rmax ÷ Rpeak: 77.3%
Cores: 80
Power: -
Per watt: - 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 VPP500/80	Fujitsu 6702TSE	-	Reported	top500.org scwww.kek.jp
CPU	Fujitsu VPP500 vector processing element CPUs Fujitsu vector · 1C · 0.105 GHz · GaAs 80 VPP500 vector processing elements	Fujitsu 6702TSE	80 reported	Reported	top500.org scwww.kek.jp
Interconnect	Fujitsu VPP500 crossbar Interconnect Full crossbar · 400 MB/s per direction Full distributed crossbar	Fujitsu 6702TSE	-	Reported	top500.org scwww.kek.jp

The read

The Fujitsu VPP500 with 80 vector processing elements that KEK's computer centre started running in January 1995, the third supercomputer installed there. KEK states each element had a 1.6 GFlop/s vector unit and 256 MB of memory, joined by a crossbar network, for 128 GFlop/s peak and about 20 GB of memory, and that it was used for lattice QCD by the JLQCD collaboration. TOP500 ranked it fifth on the June 1995 list at 98.9 GFlop/s Rmax; its page later shows 109 GFlop/s. KEK's page gives 1995-2000 as the operating period, so 2000 is recorded as the decommissioning year. TOP500 is the only source for Rmax, so the tier is reported.

Timeline

1995-01 First operational source
1995-06 List debut at #5 (June 1995) source
2000 Decommissioned source

Public list appearances

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

#5: TOP500, June 1995 →

Site & facility

KEK Tsukuba Campus

Location: Tsukuba, Japan

scwww.kek.jp

Change history

2026-10-02 Added KEK's Fujitsu VPP500/80, fifth on the June 1995 TOP500

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
scwww.kek.jp	names system, part and count	Fujitsu VPP500 vector processing element, Fujitsu VPP500 crossbar · counts: 80
top500.org	names system, part and count	Fujitsu VPP500 vector processing element, Fujitsu VPP500 crossbar · counts: 80

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