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I could find OCP accelerator spec but it looks like an open source reimplementation, not actual SXM2. That said, the photos of SXM2-PCIe adapters I could find look almost entirely passive, so I don't think all hopes are lost either.

It would be a shame if such a thing were to fall off the back of a truck as they say

couldn't someone just buy one of those chinese sxm2 to pcie adapter boards and test continuity to get the pinouts? I have one that could take like 10 minutes

I have one, my plan was to map the pin out. My six month old has different plans for me which involve me not sleeping.

If you're willing to do the testing and post the pin out, I'll send it your way.

Would like to have it sent back when you're finished though, and I'd pay shipping both ways.

I do have the ground pins mapped out and could share that which should save some time.