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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.
Realtek Freebsd drivers are 'ok' now, but that was a long fight.
Outside of wifi (I mean Jesus christ) most of freebsd networking got fixed a decade ago, but you still need to stick with common-ish gear.
Freebsd on kvm though, that's a game breaker, especially with sriov mellanox.