Named after Mary Ann Elizabeth (Betzy) Stephansen, the first Norwegian woman to be awarded a doctorate degree.

The most powerful supercomputer in Norway

Betzy is a BullSequana XH2000, provided by Atos, and will give Norwegian researchers almost three times more capacity than previously, with a theoretical peak performance of 6.2 PetaFlops. The supercomputer is located at NTNU in Trondheim, and was set in production 24 November 2020. Betzy provides 1.5 billion CPU hours per year, and has a contracted operating time of four years (2024), with an optional one-year extension (2025).

Betzy has also gotten a GPU partition and a preproc partition. The GPU partition consists of 4 nodes. Each node has 64 CPU cores, 512 GiB memory and 4 x Nvidia A100 GPUs with 40GB memory connected by NVLink. The Preproc partition consists of 6 nodes with 1 TiB RAM each.




BullSequana XH2000

Max Floating point performance, double

6.2 Petaflops

Number of compute nodes


CPU type

AMD® Epyc™ 7742 2.25GHz

CPU cores in total


CPU cores per node


Memory in total

344 TiB

Memory per node

256 GiB

GPU type

Nvidia A100 40 GB with NVLink

GPUs per node


GPUs in total


Operating System

Red Hat Enterprise Linux 7

Total disc capacity

7.7 PB


InfiniBand HDR 100, Dragonfly+ topology

Top500 June 2020

55th place @ 1250 nodes, 76% efficiency

Almost all components are liquid cooled resulting in a very high cooling efficiency, 95% of heat being captured to water.