Supercomputers/Systems/Nebius Mäntsälä Cluster
Finland · operational · ai training
Nebius Mäntsälä Cluster
Deep dive: How Nebius and Nscale build GPU clouds
Also known as Nebius Finland data center
Operated by Nebius at Nebius Mäntsälä Data Center .
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
- -
- Rpeak
- -
- Rmax ÷ Rpeak
- -
- Cores
- -
- Power
- -
- Per watt
- - 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 |
|---|---|---|---|---|---|
| Accelerator | NVIDIA H200 SXM Accelerators CUDA (Hopper GH100) · 16,896C · 1.98 GHz · TSMC 4N · 700 W NVIDIA H200 Tensor Core GPUs available from November 2024; up to 60,000 GPUs (H100 and H200) at the 75 MW full capacity, no per-model count stated | NVIDIA | - | Reported | nebius.com |
| Accelerator | NVIDIA H100 SXM5 Accelerators CUDA (Hopper GH100) · 16,896C · 1.98 GHz · TSMC 4N · 700 W NVIDIA H100 Tensor Core GPUs already installed and described as the backbone of Nebius's fleet; no per-model count stated | NVIDIA | - | Reported | nebius.com |
AI datacenter metrics
Figures beyond an accelerator count, each with who stated it. What can and cannot be compared across AI datacenters.
| Metric | Value | As of | Basis | Note | Source |
|---|---|---|---|---|---|
| Accelerators | 60,000 accelerators | 2024-10 | Design target | 'Up to 60,000 GPUs' at the full 75 MW build-out per Nebius (Oct 2024). Capacity target, not installed count. | nebius.com |
| Facility power | 75 MW | 2024-10-08 | Design target | Nebius: Finland data center capacity tripled to 75 MW (up to 60,000 GPUs). IT vs total not stated. Planned expansion total, site-level. | nebius.com |
| PUE | 1.1 | 2024-10 | Operator stated | Nebius states PUE of 1.1 under high IT loads at the Finland site (Oct 2024 expansion announcement). | nebius.com |
| WUE | 0.02 L/kWh | 2025-12 | Operator stated | Finland-1 (Mantsala) WUE for 2025 from Nebius 2025 Sustainability Report (30 Jul 2026). Both links relay the same report. Portfolio PUE was 1.25. | stocktitan.netconvergedigest.com |
The read
Nebius's owned data center in Mäntsälä, Finland, tripled from 25 MW to 75 MW in an expansion announced 8 October 2024, with room for up to 60,000 GPUs at full capacity: NVIDIA H100 already installed, H200 available from November 2024 and Blackwell expected in 2025. Nebius states a PUE of 1.1 under high load, free cooling and heat recovery of about 20,000 MWh a year. Nebius's March 2026 Lappeenranta announcement describes Mäntsälä as its existing 75 MW facility. The status date is the expansion announcement; no fetched page confirms the final GPU count deployed. Both sources are Nebius's own, so the tier is reported. It has never submitted an HPL result.
Timeline
- 2024-10-08 Announced source
Site & facility
Nebius Mäntsälä Data Center
- Location
- Mäntsälä, Finland, Finland
- Cooling
- Free cooling with heat recovery
- PUE
- 1.1
Change history
- 2026-10-04 Added AI datacenter metrics for nebius-mantsala
- 2026-10-02 Added Nebius Mäntsälä Cluster (Nebius)
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 | - |
| nebius.com | names system and part | NVIDIA H200 SXM, NVIDIA H100 SXM5 |
Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.