USA · decommissioned · hpc

Cab

Also known as LLNL Cab TLCC2 cluster

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: 347.40 TFlop/s
Rpeak: 425.98 TFlop/s
Rmax ÷ Rpeak: 81.6%
Cores: 20,480
Power: 421 kW
Per watt: 0.8 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	- Xtreme-X (Appro)	Cray HPENYSE rolls up to Hewlett Packard Enterprise	-	Reported	top500.org hpc.llnl.gov
CPU	Intel Xeon E5-2670 CPUs x86-64 · 8C · 2.6 GHz · 32 nm · 115 W Xeon E5-2670 8C 2.600GHz	Intel INTCNASDAQ	-	Reported	top500.org hpc.llnl.gov
Interconnect	Mellanox InfiniBand QDR Interconnect Fat tree · 40 Gb/s per 4x port Infiniband QDR	NVIDIA NVDANASDAQ	-	Reported	top500.org hpc.llnl.gov

The read

Appro Xtreme-X capacity cluster bought through the Tri-Lab Linux Capacity Cluster 2 (TLCC2) program and shared between LLNL's Multiprogrammatic and Institutional Computing and ASC users, 63rd on the November 2012 TOP500. TOP500 lists 20,480 Xeon E5-2670 8-core 2.6 GHz cores on InfiniBand QDR at 347.4 TFlop/s Rmax and 425.98 TFlop/s Rpeak. LLNL's page, now marked decommissioned, independently confirms the Appro vendor, E5-2670 processors and InfiniBand QDR with 1,296 nodes and 20,736 cores (login and debug nodes included), but gives no decommissioning date, so none is recorded. TOP500 is the only source for Rmax and Rpeak, so the tier is reported.

Timeline

2012 First operational source
2012-11 List debut at #63 (November 2012) source

Public list appearances

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

#63: TOP500, November 2012 →

Site & facility

Livermore Computing Center

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

hpc.llnl.gov llnl.gov

Change history

2026-10-02 Added Cab, the LLNL TLCC2 Xtreme-X cluster, 63rd on the November 2012 TOP500

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.

Every source cited on this page was readable, and none of them mentions this system. They are cited at page granularity, normally because no stable deep link could be found. That is a real weakness in this row and it is why the system carries a confidence tier below verified. See how this check works.

Cited source	Result	Found on the page
hpc.llnl.gov	does not name this system	Intel Xeon E5-2670
top500.org	does not name this system	Intel Xeon E5-2670, Mellanox InfiniBand QDR

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

Cab