HPE Cray EX4000 (Hunter)

Image f. HPE Cray EX4000 (Hunter)

Hunter is HLRS’s upcoming next-generation supercomputer. Installation will begin in September 2024, and the new system is expected to begin operating in the first half of 2025.

Hunter is based on the HPE Cray EX4000 supercomputer, which is designed to deliver exascale performance to support large-scale workloads across modeling, simulation, artificial intelligence, and high-performance data analytics. Hunter will transition away from Hawk’s emphasis on CPU processors to make greater use of more energy-efficient GPUs. It will be based on the AMD Instinct™ MI300A accelerated processing unit (APU), which combines CPU and GPU processors together with high-bandwidth memory into a single package, enabling fast data transfer speeds, impressive HPC performance, easy programmability, and great energy efficiency. This will slash the energy required to operate Hunter in comparison to Hawk by approximately 80% at peak performance. Hunter is conceived as a transitional system that will enable HLRS system users to prepare for its upcoming exascale system, Herder, currently scheduled to arrive in 2027.


Funding for the Hunter supercomputer is provided by the German Federal Ministry of Education and Research and the Baden-Württemberg Ministry for Science, Research and Arts through the Gauss Centre for Supercomputing.

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System components

System Type: HPE Cray EX4000

Expected system peak performance 39 petaFLOPS
Form factor 1U blade for EX4000 and EX2500
Processor AMD Instinct MI300A APU
Core count 24 CPU cores and 228 compute cores per APU
96 CPU cores and 912 compute cores per node


Memory technology HMB3 ~5.3 TB/s per MI300A APU
Memory / blade 128 GB HBM3 per MI300A APU

Data storage and networking

Storage Cray ClusterStor
0 or 1 local NVMe M.2 SSD per node
Networking HPE Slingshot 11
4 injection ports per node, 4 x 200 Gbps


Programming environment

HPE Cray Programming Environment  

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