USA · operational · hpc

NASA Athena

Also known as NAS Athena

Operated by NASA at NASA Advanced Supercomputing Facility .

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: 15.98 PFlop/s
Rpeak: 20.13 PFlop/s
Rmax ÷ Rpeak: 79.4%
Cores: 262,144
Power: 1.29 MW
Per watt: 12.4 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 EX4000, four racks	Hewlett Packard Enterprise HPENYSE	-	Verified	nas.nasa.gov top500.org
CPU	AMD EPYC 9005 (Turin) CPUs x86-64 · 192C · 2.7 GHz · TSMC N3E · 500 W AMD EPYC 9745 128-core 2.4 GHz, one per node, 1,024 nodes	AMD AMDNASDAQ	1,024 reported	Verified	nas.nasa.gov top500.org
Interconnect	HPE Slingshot-11 Interconnect Dragonfly · 200 Gb/s per port · Around 2 microseconds Slingshot-11, two Cassini NICs per node	Hewlett Packard Enterprise HPENYSE	-	Verified	nas.nasa.gov top500.org
Operating system	Tri-Lab Operating System Stack Operating systems Linux distribution, RHEL-derived, HPC-tuned · Open source, LLNL-maintained Tri-Lab Operating System Stack (TOSS)	Lawrence Livermore National Laboratory	-	Verified	nas.nasa.gov top500.org

The read

NASA Advanced Supercomputing Division's newest system, in the Modular Supercomputing Facility at Ames: four HPE Cray EX4000 racks holding 1,024 nodes, each with a 128-core AMD EPYC 9745 at 2.4 GHz and 768 GB DDR5 (786 TB in all), with two Slingshot-11 Cassini NICs per node, running TOSS under PBS Professional. The NAS page gives 262,144 cores and 20.132 PFlop/s theoretical peak and says it was released to NAS users at the end of December 2025; TOP500 independently lists the same 262,144 cores and 20.13 PFlop/s Rpeak, with Rmax 15.98 PFlop/s and 1,291.19 kW, ranking 116th in November 2025 and 135th in June 2026. The name is disambiguated from Cyfronet's Athena.

Timeline

2025-11 List debut at #116 (November 2025) source
2025-12 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.

#116: TOP500, November 2025 →

Site & facility

NASA Advanced Supercomputing Facility

Location: Moffett Field, CA, USA
Cooling: Air and liquid hybrid
Commissioned: 1987

nas.nasa.gov

Change history

2026-10-04 Added NASA Athena (nasa)

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
nas.nasa.gov	names system, part and count	AMD EPYC 9005 (Turin), HPE Slingshot-11, Tri-Lab Operating System Stack · counts: 1024
top500.org	names system and part	AMD EPYC 9005 (Turin), HPE Slingshot-11, Tri-Lab Operating System Stack

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