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Each GPU compute node has one AMD Trento EPYC CPU with 64 cores and 256GB of RAM. The Trento CPU architecture is similar to the Milan CPUs in the CPU nodes, with additional support for Infinity Fabric links to the four AMD MI250X GPU cards. Each MI250X card has two "logical GPUs" for a total of 8 GPUs per node. The node architecture of the Setonix GPU nodes is pictured in Figure 4 below. Each L3 cache region is connected to a logical GPU in the MI250X GPU cards via Infinity Fabric connections. These GPUs are also closely inter-connected via numerous Infinity Fabric links, and also connect to the Slingshot NIC cards for data transfer between nodes.
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