USA · operational · hpc

RZHound

Also known as LLNL RZHound

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: -
Rpeak: 2.65 PFlop/s
Rmax ÷ Rpeak: -
Cores: 41,888
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	- Dell CTS-2 nodes (386 including 2 login)	Dell Technologies DELLNYSE	386 reported	Verified	hpc.llnl.gov hpc.llnl.gov
CPU	- Intel Sapphire Rapids, 56 cores per socket, two sockets per node	Intel INTCNASDAQ	-	Reported	hpc.llnl.gov
Interconnect	Omni-Path Architecture Interconnect Fat tree · 100 Gb/s per port · About 1 microsecond Cornelis Networks fabric	Cornelis Networks	-	Reported	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	-	Reported	hpc.llnl.gov

The read

The Restricted Zone CTS-2 capacity cluster at Livermore, commissioned in 2023 for the ASC and M&IC programmes. LLNL's page gives 386 Dell nodes (2 login, 374 batch) of two Intel Sapphire Rapids sockets with 56 cores each, 41,888 batch cores, 256 GB DDR5 per node (95,744 GiB in total), a Cornelis Networks fabric, 2.655 PFlop/s CPU peak, TOSS 4 and Slurm. LLNL's platform list agrees on the 2023 year, CTS-2 class, Dell vendor and 386 nodes. The CPU model number is not stated. No TOP500 entry was found.

Timeline

2023 First operational source

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 RZHound (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 and part	Omni-Path Architecture, Tri-Lab Operating System Stack
hpc.llnl.gov	names system and part	Tri-Lab Operating System Stack

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