Supercomputers/Systems/XStream
USA · decommissioned · hpc
XStream
Also known as Stanford XStream
Operated by Stanford University at Stanford Research 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
- 781.30 TFlop/s
- Rpeak
- 1.00 PFlop/s
- Rmax ÷ Rpeak
- 78.0%
- Cores
- 14,820
- Power
- 190 kW
- Per watt
- 4.1 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 | - Cray CS-Storm | Cray HPENYSE
rolls up to Hewlett Packard Enterprise | - | Reported | top500.orgicme.stanford.edu |
| Accelerator | - NVIDIA Tesla K80 | NVIDIA | - | Reported | top500.org |
| CPU | - Intel Xeon E5-2680v2 10C 2.8GHz | Intel | - | Reported | top500.org |
| Interconnect | Mellanox InfiniBand FDR Interconnect Fat tree · 56 Gb/s per 4x port · About 1 microsecond InfiniBand FDR | Mellanox NVDANASDAQ
rolls up to NVIDIA | - | Reported | top500.orgicme.stanford.edu |
The read
Cray CS-Storm GPU cluster at Stanford's research computing facility with Xeon E5-2680v2 CPUs, NVIDIA Tesla K80 accelerators and InfiniBand FDR, built under an NSF Major Research Instrumentation grant led by Todd Martinez with Tom Abel, Margot Gerritsen and Vijay Pande. Stanford's ICME announcement promised almost a petaflop and service from late spring 2015 for more than 25 research groups plus XSEDE users. TOP500 lists 0.78 PFLOPS Rmax, 1.00 PFLOPS peak and 190 kW; it ranked 87th in June 2015 and 123rd in June 2016. No retirement date appears in the pages we cited, so the status date is the data refresh.
Timeline
Public list appearances
Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.
Site & facility
Stanford Research Computing Center
- Location
- Stanford, CA, USA
- Commissioned
- 2014
Change history
- 2026-10-02 Added XStream at Stanford
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 |
|---|---|---|
| icme.stanford.edu | does not name this system | Mellanox InfiniBand FDR |
| top500.org | names system and part | Mellanox InfiniBand FDR |
Checked 2026-10-09 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.