...
A CPU compute node has 2 AMD Milan EPYC CPUs with 64 cores each and 256Gb 256GB of RAM. The 64 cores of a Zen3 AMD CPU (shown in Figure 2 below) are evenly distributed across eight Core Chiplet Dies (CCD), each of which has 32Mb of L3 cache shared among all the cores on that CCD (shown in Figure 3 below). There is no limitation on the use of the L3 cache by a single Zen3 core, that can use up all of it. The Zen3 CPU is composed of 8 such CCDs, all connected to an additional memory and I/O controller die through the AMD Infinity Fabric. There are 8 memory channels, each with up to RAM circuits (DIMMS). The CPU supports 128 lanes of PCIe gen4 and up to 32 SATA or NVMe direct connect devices. Every two CCDs form a NUMA region. For more information about NUMA regions check the output of the lstopo-no-gui program.
...
Each GPU compute node has one AMD Trento EPYC CPU with 64 cores and 256Gb 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 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.
...