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There are RTL8127 cards with SFP+, e.g. https://www.lekuo.com/product_view.php?id=659

edit: on looking closer, that still seems to be an x4 card.

Says electrically 3x2.

Right, but I don’t think a x2 slot exists so hence being physically a x4 card. If you had an open ended x1 slot you might be able to run as PCIe v4 x1.

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