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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.
I use 10GbE for my internal network for my Ceph cluster. I’ve come about 80% of theoretical maximum for brief spikes from my NVMe drives rebalancing (mostly HDDs, few SSDs, couple NVMes).