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Note that each MI250X has two Global Graphics Compute Die Dies (GCD) that are accessible as two logical GPUs, for a total of eight per node.
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A MI250x GPU card has two GCDs. Previous generations of GPUs only had 1 GCD per GPU card, so these terms could be used interchangeably. The interchangeable usage continues even though now GPUs have more than one GCD. Slurm for instance only use the GPU terminology when referring to accelerator resources, so requests such as |
The GCD architecture is shown in Figure 5 below, and consists of 110 compute units Compute Units (CU) (for 220 per MI250X, or 880 per node) with 64GB of GPU memory (for 128GB per MI250X, or 512GB per node).
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Each Compute Unit contains 64 stream processors Stream Processors and 4 matrix coresMatrix Cores, as shown below in Figure 6.
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