Supercomputers/Systems/Underhill
Canada · operational · hpc
Underhill
Operated by Shared Services Canada at Canadian Meteorological Centre (Dorval) .
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
- 7.76 PFlop/s
- Rpeak
- 10.92 PFlop/s
- Rmax ÷ Rpeak
- 71.1%
- Cores
- 148,320
- Power
- 1.29 MW
- Per watt
- 6.0 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 | - Lenovo ThinkSystem SD650 V2 (Neptune direct water cooling) | Lenovo | - | Reported | top500.orglenovopress.lenovo.com |
| CPU | - Intel Xeon Platinum 8380 40C 2.3GHz | Intel | - | Reported | top500.org |
| Interconnect | - InfiniBand HDR | Mellanox NVDANASDAQ
rolls up to NVIDIA | - | Reported | top500.org |
The read
Robert's identical twin at Shared Services Canada, a Lenovo ThinkSystem SD650 V2 Neptune direct-water-cooled cluster with the same Intel Xeon Platinum 8380 processors, InfiniBand HDR fabric and Rmax/Rpeak figures, first listed on the June 2022 TOP500 at rank 69, one place above Robert on the same list. Named after Anne Barbara Underhill, a Canadian astrophysicist, continuing SSC's practice of naming its supercomputers after Canadian scientists. As with Robert, the Government of Canada's combined 15.5 petaFLOPS figure for the pair is corroborated by summing TOP500's individual Rmax figures for the two machines, but the tier stays reported since no source gives Underhill's figures independently of TOP500.
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
Canadian Meteorological Centre (Dorval)
- Location
- Dorval, QC, Canada
- Commissioned
- 2022
Change history
- 2026-09-24 Underhill added, Robert's twin at Shared Services Canada
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 |
|---|---|---|
| top500.org | names system only | - |
| canada.ca | names system only | - |
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.