Supercomputers/Systems/Pecos
USA · operational · hpc
Pecos
Also known as Sandia Appro Xtreme-X Pecos
Operated by Sandia National Laboratories .
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: 1263 of 1345 systems have a readable citation that names them, and 56 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
- 336.80 TFlop/s
- Rpeak
- 410.01 TFlop/s
- Rmax ÷ Rpeak
- 82.1%
- Cores
- 19,712
- Power
- 421.2 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 | - Appro Xtreme-X cluster, 1,232 nodes | Appro HPENYSE
rolls up to Hewlett Packard Enterprise | - | Reported | top500.orgweb.archive.org |
| CPU | Intel Xeon E5-2670 CPUs x86-64 · 8C · 2.6 GHz · 32 nm · 115 W Intel Xeon E5-2670 8C 2.6GHz, 16 cores per node | Intel | - | Reported | top500.orgweb.archive.org |
| Interconnect | Mellanox InfiniBand QDR Interconnect Fat tree · 40 Gb/s per 4x port InfiniBand QDR | NVIDIA | - | Reported | top500.orgweb.archive.org |
The read
Appro Xtreme-X capacity cluster of Sandia National Laboratories. TOP500 lists Xeon E5-2670 8C 2.6GHz processors on InfiniBand QDR running Linux, 19,712 cores, Rmax 336.80 TFlop/s, Rpeak 410.01 TFlop/s and 421.2 kW; it first appeared 52nd on the June 2012 list and was last listed 408th in June 2016. Sandia's HPC capacity-cluster table, captured by the Internet Archive in 2019, lists Pecos in its SCN group as Appro hardware with 1,232 nodes, 19,712 cores of 16-core Sandy Bridge E5-2670 nodes on InfiniBand, 0.392 petaflops and a September 2012 general-availability date (TOP500's first list appearance is June 2012); the core count and vendor agree across the two independent sources. TOP500 now credits Cray/HPE as manufacturer after Cray acquired Appro.
Timeline
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Change history
- 2026-10-09 Added Pecos
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 |
|---|---|---|
| web.archive.org | names system and part | Mellanox InfiniBand QDR |
| top500.org | names system and part | Intel Xeon E5-2670, Mellanox InfiniBand QDR |
Checked 2026-10-13 by pnpm verify. Re-run it and the table changes with the web.
Further reading
Operating a supercomputer
Acceptance testing, why "installed" and "in production" are six months apart, and the machine lifecycle.
Inside a node
Latency-optimised versus throughput-optimised processors, NUMA, and the end of the host-to-device copy.
The interconnect
Topologies, why latency and tail behaviour matter more than bandwidth, and how the fabric market consolidated.