Supercomputers/Systems/ISEG2
Netherlands · operational · ai training
ISEG2
Operated by Nebius at Nebius Amsterdam .
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
- 202.4 PFlop/s
- Rpeak
- 338.5 PFlop/s
- Rmax ÷ Rpeak
- 59.8%
- Cores
- 718,848
- Power
- 5.30 MW
- Per watt
- 38.2 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 NB-D-SR-IESH6 | Nebius | - | Reported | top500.org |
| Accelerator | NVIDIA H200 SXM Accelerators CUDA (Hopper GH100) · 16,896C · 1.98 GHz · TSMC 4N · 700 W NVIDIA H200 SXM5 141 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 |
| Operating system | Ubuntu Server Operating systems Linux distribution · Open source, free with paid support tiers Ubuntu 22.04 | Canonical | - | Reported | top500.org |
The read
A Nebius (the AI-cloud company spun out of Yandex, now Nasdaq: NBIS) H200 cluster; first appeared on TOP500 in June 2025 at rank 13, sliding to rank 15 by June 2026 as newer systems outpaced it. No Nebius statement names this cluster or ties it to Amsterdam specifically; both the siting and every performance figure here rest on TOP500's own listing alone.
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
Change history
- 2026-09-22 Gained a Green500 rank pointer (#67 on the 2025-06 list)
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 | Intel Xeon Platinum 8468, NVIDIA H200 SXM, NVIDIA InfiniBand NDR (Quantum-2), Ubuntu Server |
Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.
Further reading
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.
Programming a supercomputer
The software stack beneath the application, and why the OS is now a sovereignty signal as much as a technical choice.