USA · operational · hpc

Matrix

Also known as LLNL CTS-2 Matrix

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: 3.11 PFlop/s
Rpeak: 3.50 PFlop/s
Rmax ÷ Rpeak: 88.9%
Cores: 12,800
Power: 84.3 kW
Per watt: 36.9 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	- Dell PowerEdge XE9640	Dell Technologies DELLNYSE	-	Verified	top500.org hpc.llnl.gov
Accelerator	NVIDIA H100 SXM5 Accelerators CUDA (Hopper GH100) · 16,896C · 1.98 GHz · TSMC 4N · 700 W NVIDIA H100, four per compute node (112 GPUs per LLNL)	NVIDIA NVDANASDAQ	112 reported	Reported	hpc.llnl.gov top500.org
CPU	- Intel Xeon Platinum 8480+	Intel INTCNASDAQ	-	Reported	top500.org hpc.llnl.gov
Interconnect	NVIDIA InfiniBand NDR (Quantum-2) Interconnect Fat tree or dragonfly+ · 400 Gb/s per port · Under 0.6 microseconds Infiniband NDR	NVIDIA NVDANASDAQ	-	Reported	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 4	Lawrence Livermore National Laboratory	-	Verified	hpc.llnl.gov top500.org

The read

A small GPU partition of Livermore's CTS-2 line, a Dell PowerEdge XE9640 system with Intel Xeon Platinum 8480+ hosts and NVIDIA H100 GPUs on InfiniBand NDR, running TOSS. TOP500 lists 12,800 cores, Rmax 3.11, Rpeak 3.50 PFlop/s and 84.3 kW; it debuted 406th in November 2025 and was 432nd in June 2026. LLNL's platform page gives 30 nodes (2 login, 26 batch, 2 debug) with four H100 GPUs per compute node, 112 GPUs in total, 1,792 CPU cores, 512 GB DDR5 per node and about 4.0 PFlop/s combined peak, installed 2025 in limited availability. The TOP500 core count does not match the LLNL page, so it is carried as published.

Timeline

2025 First operational source
2025-11 List debut at #406 (November 2025) source

Public list appearances

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

#406: TOP500, November 2025 →

Site & facility

Livermore Computing Center

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

hpc.llnl.gov llnl.gov

Change history

2026-10-04 Added Matrix (llnl)

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, part and count	NVIDIA H100 SXM5, Tri-Lab Operating System Stack · counts: 112
top500.org	names system and part	NVIDIA H100 SXM5, NVIDIA InfiniBand NDR (Quantum-2)

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