Core concept
PCIe: standard PCIe slot. Passive cooling. Lower TDP (~350W). No native NVLink between GPUs.
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How it works
SXM only in NVIDIA-approved systems (DGX, HGX, cloud). PCIe in standard servers.
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Trade-offs + gotchas
Training + tightly-coupled: SXM. Inference + workstations: PCIe.