LUMI AI Supercomputer Data Center

LUMI resides in a repurposed paper mill in Kajaani, Finland, where abundant hydroelectric power and direct liquid cooling enable one of the world’s fastest and greenest supercomputers. The HPE Cray EX system packs 10,240 AMD Instinct MI250X GPUs and high-memory CPU partitions connected by Slingshot-11 networking, sustaining 379.5 petaflops on LINPACK and over an exaflop of AI throughput. Warm-water cooling captures waste heat for the local district heating network, yielding an effective PUE near 1.04 while powering European research into climate digital twins, biosciences, and large-scale AI models.