Denmark · operational · ai training

Gefion

Operated by Danish Centre for AI Innovation at Danish Centre for AI Innovation (Digital Realty) .

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: 66.59 PFlop/s
Rpeak: 100.6 PFlop/s
Rmax ÷ Rpeak: 66.2%
Cores: 223,088
Power: 1.75 MW
Per watt: 38.0 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	- NVIDIA DGX SuperPOD, assembled by Eviden	Eviden ATOEPA rolls up to Atos	-	Verified	top500.org novonordiskfonden.dk
Accelerator	NVIDIA H100 SXM5 Accelerators CUDA (Hopper GH100) · 16,896C · 1.98 GHz · TSMC 4N · 700 W 1,528 NVIDIA H100 GPUs	NVIDIA NVDANASDAQ	-	Verified	top500.org novonordiskfonden.dk
CPU	Intel Xeon Platinum 8480C CPUs x86-64 · 56C · 2 GHz · Intel 7 · 350 W Xeon Platinum 8480C 56C 2GHz	Intel INTCNASDAQ	-	Reported	top500.org
Interconnect	NVIDIA InfiniBand HDR Interconnect Fat tree or dragonfly+ · 200 Gb/s per port · About 0.6 microseconds Octo-rail NVIDIA HDR100 Infiniband / NVIDIA Quantum-2	NVIDIA NVDANASDAQ	-	Verified	top500.org novonordiskfonden.dk
Operating system	Red Hat Enterprise Linux Operating systems Linux distribution · Open source, commercial support subscription Red Hat Enterprise Linux	Red Hat IBMNYSE rolls up to IBM	-	Reported	top500.org

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	1,528 accelerators	2024-10	Operator stated	H100 GPUs in the DGX SuperPOD, per the Novo Nordisk Foundation launch release (23 Oct 2024).	novonordiskfonden.dk

The read

Denmark's first AI supercomputer, funded jointly by the Novo Nordisk Foundation and the state export-credit fund EIFO rather than by a research-council budget alone: a novel funding pattern for a national AI resource. Built and assembled by Eviden in six months from announcement to completion, per the operator's own account.

Timeline

2024-10 First operational source
2025-06 List debut at #54 (June 2025) source

Public list appearances

Pointers only: rank and edition, linking to the canonical entry. We do not reproduce list tables. See sourcing policy.

Site & facility

Danish Centre for AI Innovation (Digital Realty)

Location: Copenhagen, Denmark
Commissioned: 2024

novonordiskfonden.dk

Change history

2026-10-04 Added AI datacenter metrics for gefion
2026-09-22 Gained a Green500 rank pointer (#54 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
novonordiskfonden.dk	names system and part	NVIDIA H100 SXM5, NVIDIA InfiniBand HDR
top500.org	names system and part	NVIDIA H100 SXM5, Intel Xeon Platinum 8480C, NVIDIA InfiniBand HDR

Checked 2026-10-09 by pnpm verify. Re-run it and the table changes with the web.