Norway · operational · hpc

Betzy

Operated by Sigma2 at Sigma2 (Trondheim) .

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: 4.72 PFlop/s
Rpeak: 6.19 PFlop/s
Rmax ÷ Rpeak: 76.3%
Cores: 172,032
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
Integrator	- Atos BullSequana XH2000	Eviden ATOEPA rolls up to Atos	-	Verified	documentation.sigma2.no top500.org
Accelerator	NVIDIA A100 SXM4 40GB Accelerators CUDA (Ampere GA100) · 6,912C · 1.41 GHz · 7 nm · 400 W 16 NVIDIA A100 40GB GPUs in 4 nodes	NVIDIA NVDANASDAQ	16 reported	Reported	documentation.sigma2.no
CPU	AMD EPYC 7742 (Rome) CPUs x86-64 · 64C · 2.25 GHz · 7 nm · 225 W AMD EPYC 7742 2.25GHz, 1,344 nodes	AMD AMDNASDAQ	-	Verified	documentation.sigma2.no top500.org
Interconnect	NVIDIA InfiniBand HDR Interconnect Fat tree or dragonfly+ · 200 Gb/s per port · About 0.6 microseconds InfiniBand HDR100, Dragonfly+	NVIDIA NVDANASDAQ	-	Verified	documentation.sigma2.no top500.org
Cooling	Direct liquid cooling, warm water Cooling Direct-to-chip cold plates, facility water loop · Removes 90+ percent of node heat to liquid almost all components liquid cooled, 95% of heat captured to water	Eviden ATOEPA rolls up to Atos	-	Reported	documentation.sigma2.no
Operating system	Red Hat Enterprise Linux Operating systems Linux distribution · Open source, commercial support subscription RHEL 7	Red Hat IBMNYSE rolls up to IBM	-	Verified	documentation.sigma2.no top500.org

The read

Norway's national system at NTNU, an Eviden BullSequana XH2000 of 1,344 AMD EPYC 7742 nodes and four NVIDIA A100 nodes on HDR100, put in production on 24 November 2020 and 55th on the June 2020 TOP500 at 4.42 PFlop/s before later runs raised it to 4.72. Sigma2 is the only source for the hardware and dates, and it states a contracted operating life to 2025 that has since been extended by listing. TOP500 is the only source for Rmax, Rpeak and core count, so the tier is reported.

Timeline

2020-06 List debut at #55 (June 2020) source
2020-11 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.

#55: TOP500, June 2020 →

Site & facility

Sigma2 (Trondheim)

Location: Trondheim, Norway
Commissioned: 2020

documentation.sigma2.no

Change history

2026-09-20 Added with a rank pointer on the edition where it ranked highest

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
documentation.sigma2.no	names system, part and count	AMD EPYC 7742 (Rome), NVIDIA A100 SXM4 40GB, NVIDIA InfiniBand HDR · counts: 16
top500.org	names system, part and count	AMD EPYC 7742 (Rome), NVIDIA InfiniBand HDR · counts: 16

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