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Overview

Here you find a description of the LUMI system architecture and the different hardware partitions available on LUMI.

LUMI is one of the three European pre-exascale supercomputers. It's an HPE Cray EX supercomputer consisting of several hardware partitions targeted different use cases. All the hardware partitions (except LUMI-K) are connected via an HPE Slingshot 11 high-speed interconnect. As of 06/2025, LUMI ranks ninth on the top500.org list and is currently the fourth fastest supercomputer in Europe.

The primary compute power in LUMI is found in the LUMI-G hardware partition which features GPU accelerated nodes using AMD Instinct MI250X GPUs. Complementing this is the smaller LUMI-C CPU-only hardware partition that features AMD EPYC "Milan" CPUs, as well as a small LUMI-D data analytics hardware partition featuring large memory nodes (4 TB) and some NVIDIA A40 GPUs for data visualization. In addition, the LUMI‑K cloud partition provides Kubernetes compute resources based on AMD EPYC 7742 CPUs.