USA · operational · hpc

Crossroads

Operated by Los Alamos National Laboratory at Los Alamos Strategic Computing Complex .

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: 30.03 PFlop/s
Rpeak: 40.18 PFlop/s
Rmax ÷ Rpeak: 74.7%
Cores: 660,800
Power: 6.28 MW
Per watt: 4.8 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	- HPE Cray EX	Hewlett Packard Enterprise HPENYSE	-	Reported	top500.org lanl.gov
CPU	Intel Xeon CPU Max 9470 CPUs x86-64 · 52C · 2 GHz · Intel 7 · 350 W Xeon CPU Max 9480 56C 1.9GHz	Intel INTCNASDAQ	-	Reported	top500.org lanl.gov
Interconnect	HPE Slingshot-11 Interconnect Dragonfly · 200 Gb/s per port · Around 2 microseconds Slingshot-11	Hewlett Packard Enterprise HPENYSE	-	Reported	top500.org lanl.gov
Cooling	Direct liquid cooling, warm water Cooling Direct-to-chip cold plates, facility water loop · Removes 90+ percent of node heat to liquid HPE Cray EX with next-generation liquid cooling	Hewlett Packard Enterprise HPENYSE	-	Reported	newswise.com nextplatform.com
Operating system	HPE Cray Operating System Operating systems SUSE-derived Linux, container-based management · Proprietary layer over open-source Linux HPE Cray OS	Hewlett Packard Enterprise HPENYSE	-	Reported	top500.org

The read

An NNSA ATS-3 stockpile-stewardship system, CPU-only (Xeon Max with on-package HBM, no accelerator), jointly built and operated by Los Alamos and Sandia under the ACES partnership and used tri-lab under the ASC program, the same joint-operator pattern already recorded for `trinity`. Sited at Los Alamos, so it reuses that site row. LANL's own platform page confirms the architecture and joint operatorship but not an exact Rmax/Rpeak/power figure, so those stay TOP500-sourced.

Timeline

2023 First operational source
2025-06 List debut at #166 (June 2025) source

Public list appearances

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

Site & facility

Los Alamos Strategic Computing Complex

Location: Los Alamos, NM, USA
Cooling: Chilled water
Commissioned: 1993

lanl.gov

Change history

2026-09-22 Gained a Green500 rank pointer (#166 on the 2025-06 list)

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
top500.org	names system and part	Intel Xeon CPU Max 9470, HPE Slingshot-11, HPE Cray Operating System
lanl.gov	names system only	-

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