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I’ve three Intel Branded X550-T2 playing cards bought new at retail (photos connected).  I can solely get them to run at 2 Gbits/sec per iperf3 in Home windows 11 Professional 23H2 64-bit.  I’ve upgraded the drivers to 4.1.252.0 and NVM to three.6.  Playing cards put in in PowerSpec B741 desktop computer systems:  ASUS Prime Z370-P motherboard; Intel Core i7-8700K processor.  Cat 7 cables (identical outcomes with Cat 8 patch cable working between two computer systems).  Tried options at following hyperlink with no enchancment.  How can I repair this?

https://www.intel.com/content material/www/us/en/help/articles/000058667/ethernet-products/gigabit-ethernet-controllers-up-to-2-5gbe.html