06-02-2018 08:53 PM - edited 06-02-2018 08:58 PM
Hello and welcome,
Just going on what I read:
From the base spec:
"Native Intel Ethernet Connection WGI219-LM (vPro) via optional ThinkPad Ethernet Extension Cable"
"Data Rate Per Port 1 Gbps"
From the sales site:
"Ethernet Extension Connector (Dongle for Native Ethernet sold separately)"
And from Accessory Smart Find:
"...X1 Yoga 3rd Generation... 20LE, 20LF"
The Google turns up multiple sources for 4X90F84315 including Lenovo and Amazon.
As to advantages? Depends on your use case. As you said, doesn't burn a USB port. Doesn't require a special driver - although that's probably not much of an issue for USB adpters. Maybe with non-Windows OS-en. Can do PXE boot if that's important.
As I said, I'm going on what I read in the above. Please confirm before purchasing.
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