Supercomputers/Systems/Leo (Debrecen)
Hungary · operational · hpc
Leo (Debrecen)
Also known as Leo; Leo NIIFI-Debrecen
Operated by University of Debrecen .
Researched with AI assistance, checked by scripts. These rows were researched by AI agents reading public operator, laboratory and vendor sources, appended by scripts and checked by automated validation; no subject-matter expert has reviewed them (how this site is made). A mechanical second-reader pass has since fetched every cited source: 1350 of 1540 systems have a readable citation that names them, and 64 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
- 253.60 TFlop/s
- Rpeak
- 363.84 TFlop/s
- Rmax ÷ Rpeak
- 69.7%
- Cores
- 4,890
- Power
- 122 kW
- Per watt
- 2.1 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 | - HPE Cluster Platform SL250s Gen8 | Hewlett Packard Enterprise | - | Reported | top500.org |
| Accelerator | - NVIDIA K20x/K40 | NVIDIA | - | Reported | top500.org |
| CPU | - Intel Xeon E5-2650v2 8C 2.6GHz | 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.org |
The read
Leo is the second supercomputer of the University of Debrecen's Supercomputer Centre, following Gyires (2011); the university says it arrived in 2015, when it was among the world's 500 most powerful computers. TOP500 lists an HPE Cluster Platform SL250s Gen8 with Xeon E5-2650v2 8C 2.6 GHz, InfiniBand FDR and NVIDIA K20x/K40 GPUs under the site name National Information Infrastructure Development, with an install year of 2014 (the sources disagree on 2014 versus 2015). It debuted 308th in November 2014 at 3,696 cores and 197.21 TFlop/s, then 370th in June 2015, and 402nd in November 2015 at 4,890 cores, 253.6 TFlop/s Rmax, 363.84 TFlop/s Rpeak and 122 kW (its last list). The university's page gives no hardware figures.
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
- 2026-10-18 Leo (Debrecen) added from its source pages
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.