Any Ethernet upgrade would need to be external (USB 3);  the internal 10/100/1000 Ethernet is on the system board and not upgradeable internally. For WiFi, you can still find WiFi 6 cards in half minicard (half mini PCIe) format, though not from Intel.  All of Intel's WiFi 6 cards are M.2/NGFF, which will not work with the system. Example: [URL]  
Hi, For a 2012 released Alienware M18x R2, what options are there for upgrading network cards? I have Virgin media with 1.1 to 1.3gb download speed (most often). Thanks
M18x R2, network card upgrade options?