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I'm a bit surprised that Nvidia mentioned nothing about performance per watt in their reply.

Or that they didn't mention cost for performance. They equated 4 Xeon Phi servers to ONE DGX-1. The DGX has a 140k price tag.

That was for performance scaling, not raw performance. Although 140k probably includes a nice interconnect.

That usually implies something pretty specific, like maybe that's the only terms on which they're competitive?