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Realtek's $10 tiny 10GbE network adapter is coming to motherboards later this year
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
And your pc is connected by fiber directly to the modem? It sounds like not, which was the point of of the parent comment. But you can't tell me that you think this is a normal and typical use case, to install PCI-E fiber optic network card.