Supercomputers/Systems/Hopper (NERSC)
USA · decommissioned · hpc
Hopper (NERSC)
Operated by Lawrence Berkeley National Laboratory at NERSC, Shyh Wang Hall .
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
- 1.05 PFlop/s
- Rpeak
- 1.29 PFlop/s
- Rmax ÷ Rpeak
- 81.8%
- Cores
- 153,408
- Power
- 2.91 MW
- Per watt
- 0.4 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 XE6 | Cray HPENYSE
rolls up to Hewlett Packard Enterprise | - | Reported | top500.org |
| Interconnect | Cray Gemini Interconnect 3D torus · About 6 GB/s per direction per link · Around 1 microsecond Cray Gemini interconnect | Cray HPENYSE
rolls up to Hewlett Packard Enterprise | - | Reported | top500.org |
The read
NERSC's Cray XE6, fifth on the November 2010 TOP500 with 153,408 cores. NERSC's news item confirms the petaflop milestone in May 2011 and a NERSC article on Edison's retirement implies Hopper was retired earlier, but no page we fetched gives a retirement date, so none is recorded. TOP500 is the only source for Rmax, Rpeak and core count, so the tier is reported.
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
NERSC, Shyh Wang Hall
- Location
- Berkeley, CA, USA
- Cooling
- Direct liquid cooling with cooling towers
- Commissioned
- 2015
Change history
- 2026-09-20 Added with a rank pointer on the edition where it ranked highest
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 |
|---|---|---|
| nersc.gov | names system and part | Cray Gemini |
| top500.org | names system and part | Cray Gemini |
Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.