Why it matters
NVLink switch shapes multi-GPU BW. Understanding shapes DGX + NVL72.
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The architecture
Switch chip.
Ports connect to GPUs.
Enables non-adjacent GPU comm.
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How it works end to end
DGX H100: 4 NVSwitches per node.
NVL72: switches enable 72-GPU coherent domain.
Cross-node NVLink coming.