Why it matters
NVSwitch generations shape performance. Understanding shapes hardware choice.
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The architecture
Ports per switch.
Bisection bandwidth.
Latency per hop.
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How it works end to end
NVSwitch3: 900GB/s per GPU, 4 switches per DGX H100.
NVSwitch4: 1.8TB/s per B200, NVL72 rack-scale.