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The GPU partition of Setonix is made up of 192 nodes, 38 of which are high memory nodes (512 GB RAM instead of 256GB). Each GPU node features 4 AMD MI250X GPUs, as depicted in Figure 1. Each MI250X comprises 2 Graphics Complex Die (GCD), with each effectively seen as a standalone GPU by the system. A 64-core AMD Trento CPU is connected to the four MI250X with the AMD InfinityFabric interconnect, the same interconnection between the GPU cards, with a peak bandwidth of 200Gb/s. For more information refer to the Setonix General Information. Each GCD can access 64GB of GPU memory. This totals to 128GB per MI250X, and 256GB per standard GPU node.
Figure 1. A GPU node of Setonix
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