Unsure about Hardware Choice

I wouldn't fiddle around with optical SFPs and stuff in the S920, get something like https://www.tp-link.com/se/business-networking/accessory/mc210cs/ (not saying this one is right for you).
I'm sure you can find used ones that work, assuming you know what to get, but Google is
probably your friend.

I think it was a PCIe power issue.

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