On my relatively new Inspiron 5570, I can't figure out how to get the Ethernet speed above 100 Mbps. 1- Internet service of 1 gig. 2- Cable is new and carries speed of over 800MBps on other laptops. 3- WiFi on the Inspiron (from the same source) is in excess of 300 MBps. 4- The same cable connected via USB adapter is hitting 800 MBps. More @Wikipedia
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