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Can I use a 10 GbE (RJ45) NIC with a x8 PCIe 2.0 connector in a x4 PCIe 3.0 slot and get full speed? (alien.top)

submitted 11 months ago by Qbccd@alien.top to c/homenetworking@selfhosted.forum

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I'm thinking of getting a 10 GbE NIC for my computer, but I only have a spare x4 PCIe 3.0 slot. The NICs with x4 connectors are all around $90-100.

I can get an older Intel one for under $40 but they all come with x8 PCIe 2.0 connectors. I can physically plug them into my x4 PCIe 3.0 slot because it has an "open back", so they will fit and I know they will still work.

But the question is - will I get full speed. x4 PCIe 2.0 should be able to do around 2 GB/s, so even after overheard it should be able to deliver the ~1.2 GB/s that is 10 gigabit. But is it wired in a way that it can do that is the question.

What do you think, should I try it?

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[–] Background-Marzipan8@alien.top 1 points 11 months ago

It COULD work but the final results would depend on your MoBo and the drivers playing nicely.