About the HPC system Viper

Atos/Eviden system with AMD EPYC Genoa CPUs and AMD Instinct MI300A APUs

Supercomputer Viper is operational since June 2024. Viper-CPU comprises 768 compute nodes with AMD EPYC Genoa 9554 CPUs with 128 cores and at least 512 GB RAM per node. A subset of 609 nodes is equipped with 512 GB RAM, 90 nodes with 768 GB RAM, 66 nodes with 1024 GB RAM, and 3 nodes with 2304 GB RAM. As of February/March 2025, Viper-GPU  provides 300 GPU compute nodes, each with 2 AMD Instinct MI300A APUs and 2x128 GB of high-bandwith memory (HBM3) per node. The nodes are interconnected with a Nvidia/Mellanox NDR InfiniBand network using a fat-tree topology with two non-blocking islands, one for the CPU nodes (NDR200, 200 Gb/s), and one for the GPU nodes (NDR, 400 Gb/s). In addition there are 4 nodes for login and interactive tests, and I/O subsystems that serve ca. 20 PB of disk storage (attached to CPU and GPU system) with direct HSM access, plus ca. 500 TB of NVMe-based storage (attached to the GPU system).

Summary: 768 CPU compute nodes, 98304 CPU cores, 432 TB RAM (DDR5), 4.9 PFlop/s theoretical peak performance (FP64), 300 GPU nodes comprising 600 APUs, 75 TB RAM (HBM3), 36 PFlop/s theoretical peak performance (FP64 vector).

Overall compute-node configuration:

• 609 CPU compute nodes (AMD EPYC Genoa 9554 with 128 cores per node and 512 GB RAM per node)
• 90 CPU compute nodes (AMD EPYC Genoa 9554 with 128 cores per node and 768 GB RAM per node)
• 66 CPU compute nodes (AMD EPYC Genoa 9554 with 128 cores per node and 1024 GB RAM per node)
• 3 CPU compute nodes (AMD EPYC Genoa 9554 with 128 cores per node and 2304 GB RAM per node)
• 300 GPU compute nodes (2x AMD MI300A with 2x128 GB HBM3 per node) as of February 2025

Details about the hardware and software configuration can be found in the Viper-CPU user guide and Viper-GPU user guide, respectively.