Supercomputers/Systems/Sisu
Finland · decommissioned · hpc
Sisu
Also known as CSC Sisu
Operated by CSC .
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
- 1.25 PFlop/s
- Rpeak
- 1.69 PFlop/s
- Rmax ÷ Rpeak
- 74.0%
- Cores
- 40,608
- Power
- 680 kW
- Per watt
- 1.8 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 | - Cray XC40 | Cray HPENYSE
rolls up to Hewlett Packard Enterprise | - | Verified | top500.orghpc-europa.org |
| CPU | - Xeon E5-2690v3 12C 2.6GHz | Intel | - | Reported | top500.org |
| Interconnect | Cray Aries Interconnect Dragonfly · About 10 GB/s per direction · Around 1 microsecond Aries interconnect | Cray HPENYSE
rolls up to Hewlett Packard Enterprise | - | Reported | top500.org |
| Operating system | Cray Linux Environment Operating systems Linux, Cray-customised · Proprietary layer over open-source Linux Cray Linux Environment | Cray HPENYSE
rolls up to Hewlett Packard Enterprise | - | Reported | top500.org |
The read
Cray XC40 at CSC, Finland, targeted at massively parallel applications. TOP500 lists 40,608 cores of Xeon E5-2690v3 12C 2.6GHz on the Aries interconnect, 1.25 PFlop/s Rmax, 1.69 PFlop/s Rpeak and 680 kW on lists from November 2012 to June 2019, peaking at 38th in November 2014 and ranking 343rd in June 2019 (entry recorded here). TOP500 News describes it as installed in 2012 and upgraded in 2014 with under 1.7 PFlop/s peak; HPC-Europa calls it the most powerful system in Finland. It has no later TOP500 entry.
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
- 2026-10-02 Added Sisu, CSC
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 and part | Cray Aries, Cray Linux Environment |
| hpc-europa.org | 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.