Received iperf3 9.22 Gb/s results from client (45ft Cat6) and host through my switch. The client NIC uses an ASUS XG-C100C host with Mellanox ConnectX-3. It gets pretty hot, but that seems to be common with these 10GBase-T transceivers. Just let it cool (or put on gloves) if you need to take it off, it's not difficult.
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