USA · operational · hpc

rzAdams

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: 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: 24.38 PFlop/s
Rpeak: 32.10 PFlop/s
Rmax ÷ Rpeak: 76.0%
Cores: 129,024
Power: 388.2 kW
Per watt: 62.8 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 EX255a	Hewlett Packard Enterprise HPENYSE	-	Reported	top500.org
Accelerator	AMD Instinct MI300A Accelerators ROCm (CDNA 3) · TSMC N5/N6 · 550 W AMD Instinct MI300A	AMD AMDNASDAQ	-	Verified	top500.org hpc.llnl.gov
CPU	AMD 4th Gen EPYC 24C (in MI300A) CPUs x86-64 · 24C · 1.8 GHz · TSMC N5 AMD 4th Gen EPYC 24C 1.8GHz	AMD AMDNASDAQ	-	Verified	top500.org hpc.llnl.gov
Interconnect	HPE Slingshot-11 Interconnect Dragonfly · 200 Gb/s per port · Around 2 microseconds Slingshot-11	Hewlett Packard Enterprise HPENYSE	-	Verified	top500.org hpc.llnl.gov
Operating system	Tri-Lab Operating System Stack Operating systems Linux distribution, RHEL-derived, HPC-tuned · Open source, LLNL-maintained TOSS	Lawrence Livermore National Laboratory	-	Verified	top500.org hpc.llnl.gov

The read

An NNSA ATS-4 tri-lab AMD MI300A system in LLNL's Restricted Zone. LLNL's own hardware page independently states a combined CPU+GPU peak of 32.102 PFlops, matching TOP500's 32.10 Rpeak almost exactly, and independently confirms the MI300A/4th-gen-EPYC/Slingshot-11/TOSS architecture; it also resolves an apparent core-count anomaly: TOP500's 129,024 cores is the sum of 12,288 CPU cores and 116,736 GPU compute units (512 MI300As × 228 CUs), not CPU cores alone. Rmax and power draw are not independently republished, so those two facts stay TOP500-sourced within an otherwise verified row.

Timeline

2024 First operational source
2024-11 List debut at #10 (November 2024) 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

Livermore Computing Center

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

hpc.llnl.gov llnl.gov

Change history

2026-09-22 Gained a Green500 rank pointer (#10 on the 2024-11 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
hpc.llnl.gov	names system and part	Tri-Lab Operating System Stack
top500.org	names system and part	AMD Instinct MI300A, HPE Slingshot-11

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