USA · decommissioned · classified

ASCI White

Operated by Lawrence Livermore National Laboratory at Livermore Computing Center .

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: 32 of 52 systems have a readable citation that names them, and 4 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: 4.94 TFlop/s
Rpeak: 12.29 TFlop/s
Rmax ÷ Rpeak: 40.2%
Cores: 8,192
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	- IBM RS/6000 SP Power3	IBM IBMNYSE	-	Reported	hpc.llnl.gov energy.gov
CPU	IBM POWER3-II CPUs IBM RS/6000 SP Power3	IBM IBMNYSE	-	Reported	hpc.llnl.gov energy.gov
Interconnect	IBM SP Switch2 Interconnect SP Switch2	IBM IBMNYSE	-	Reported	hpc.llnl.gov energy.gov
Storage	IBM Spectrum Scale ESS (GPFS) Storage IBM GPFS	IBM IBMNYSE	-	Reported	hpc.llnl.gov energy.gov

The read

The last IBM system to reach No. 1 on RISC processors alone, before the BlueGene argument replaced fast cores with many slow ones. 106 tonnes of machine delivered on 28 trucks, and its bill of materials is one company: IBM supplied the processor, the SP Switch2 fabric and the integration.

Timeline

1996 Announced source
2000-06 First operational source
2000-11 List debut at #1 (November 2000) source
2006 Decommissioned 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, November 2000 →

Site & facility

Livermore Computing Center

Location: Livermore, CA, USA
Cooling: Direct liquid cooling (warm water)
Commissioned: 1996

hpc.llnl.gov llnl.gov

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
hpc.llnl.gov	does not name this system	-
energy.gov	names system only	-

Checked 2026-09-08 by pnpm verify. Re-run it and the table changes with the web.