[sargun]

What exactly is an SXM5 socket? It sounds like a PCIe competitor, but proprietary to nvidia. Looking at it, it seems specific to nvidia DGX (mother?)boards. Is this just a "better" alternative to PCIe (with power delivery, and such), or fundamentally a new technology?

[koheripbal]

Yes to all your questions. It's specifically designed for commercial compute servers. It provides significantly more bandwidth and speed over PCIe.

It's also enormously more expensive and I'm not sure if you can buy it new without getting the nvidia compute server.

[0xbadc0de5]

It's one of those /If you have to ask, you can't afford it/ scenarios.