Supercomputers/Systems/ISEG
Netherlands · operational · ai training
ISEG
Operated by Nebius .
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
- 46.54 PFlop/s
- Rpeak
- 86.79 PFlop/s
- Rmax ÷ Rpeak
- 53.6%
- Cores
- 218,880
- Power
- 1.32 MW
- Per watt
- 35.3 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 | - Nebius AI, Gigabyte G593-SD0 servers | Nebius | - | Reported | top500.org |
| Accelerator | NVIDIA H100 SXM5 Accelerators CUDA (Hopper GH100) · 16,896C · 1.98 GHz · TSMC 4N · 700 W NVIDIA H100 SXM5 80 GB | NVIDIA | - | Reported | top500.org |
| CPU | Intel Xeon Platinum 8468 CPUs x86-64 · 48C · 2.1 GHz · Intel 7 · 350 W Xeon Platinum 8468 48C 2.1GHz | Intel | - | Reported | top500.org |
| Interconnect | NVIDIA InfiniBand NDR (Quantum-2) Interconnect Fat tree or dragonfly+ · 400 Gb/s per port · Under 0.6 microseconds Infiniband NDR400 | NVIDIA | - | Reported | top500.org |
The read
Nebius's first H100 supercomputer, listed by TOP500 as a Gigabyte G593-SD0 cluster of Xeon Platinum 8468 48C hosts with NVIDIA H100 SXM5 80 GB GPUs on InfiniBand NDR400 under Ubuntu 20.04, 218,880 cores, 46.54 PFlop/s Rmax, 86.79 PFlop/s Rpeak and 1,320 kW. It debuted 16th on the November 2023 TOP500 and 15th on that month's Green500 at 35.258 GFlops/Watt, then slid to 19th, 29th, 39th and 44th before reaching 54th in June 2026. Nebius's own supercomputer page confirms the rank of 16th as of November 2023 but gives no hardware count or location, so the siting is left blank and the hardware rests on TOP500. It is a distinct machine from ISEG2, the later H200 system.
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 ISEG, Nebius's first H100 supercomputer
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 |
|---|---|---|
| nebius.com | names system only | - |
| top500.org | names system and part | Intel Xeon Platinum 8468, NVIDIA H100 SXM5, NVIDIA InfiniBand NDR (Quantum-2) |
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.