Sweden · operational · mixed

Arrhenius

Operated by NAISS at NAISS (Linkoping University) .

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: 66.82 PFlop/s
Rpeak: 84.02 PFlop/s
Rmax ÷ Rpeak: 79.5%
Cores: 310,080
Power: 1.09 MW
Per watt: 61.4 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 Cray EX254n	Hewlett Packard Enterprise HPENYSE	-	Reported	top500.org
Accelerator	NVIDIA GH200 Grace Hopper Superchip Accelerators Arm CPU + CUDA GPU · TSMC 4N 382 nodes x 4 NVIDIA GH200	NVIDIA NVDANASDAQ	-	Verified	top500.org naiss.se
CPU	NVIDIA Grace CPUs Armv9 (Neoverse V2) · 72C · 3.1 GHz · TSMC 4N NVIDIA Grace 72C 3.1GHz	NVIDIA NVDANASDAQ	-	Reported	top500.org
Interconnect	HPE Slingshot-11 Interconnect Dragonfly · 200 Gb/s per port · Around 2 microseconds Slingshot-11	Hewlett Packard Enterprise HPENYSE	-	Verified	top500.org naiss.se
Storage	Lustre Storage Parallel filesystem, separate metadata and object servers 2 PB flash tier + 25 PB disk tier, Lustre	Hewlett Packard Enterprise HPENYSE	-	Reported	top500.org naiss.se
Operating system	HPE Cray Operating System Operating systems SUSE-derived Linux, container-based management · Proprietary layer over open-source Linux HPE Cray OS	Hewlett Packard Enterprise HPENYSE	-	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	2026-10	Operator stated	EuroHPC systems page: GPU partition uses 1,528 NVIDIA Grace Hopper superchips.	eurohpc-ju.europa.eu

The read

A EuroHPC mid-range system at Linkoping University, on the same GH200-plus-Slingshot-11 HPE Cray EX254n design as DAEDALUS in Greece: two national EuroHPC procurements a few months apart converging on identical hardware. Three distinct, precisely dated milestones exist for this system (contract signed July 2025, entered production June 2026, formally inaugurated September 2026); this dataset records the contract and production dates and leaves the later inauguration out of scope.

Timeline

2025-07 Announced source
2026-06 List debut at #42 (June 2026) source
2026-06 First operational source

Public list appearances

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

#42: TOP500, June 2026 →

Site & facility

NAISS (Linkoping University)

Location: Linkoping, Sweden
Commissioned: 2026

naiss.se naiss.se

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	NVIDIA GH200 Grace Hopper Superchip, NVIDIA Grace, HPE Slingshot-11, HPE Cray Operating System
eurohpc-ju.europa.eu	names system only	-

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