I am talking about an external graphics where you have a dock that allows you to add in a full sized discrete internal desktop graphics card and use it on an external dock that enhances the power of your laptop.
I have seen people hook up to a variety of ways. Some use the mini PCIe which holds the wifi card. Some plug it into an expressport. Some put it into an hdmi in (although such is rare). Some laptop models such as razer and alienware have external graphics card docks you can buy, but it only works for those models.
X1 Carbon 2016, the bottom is one piece. You could not plug in a wire even if there is a wireless pcie without either leaving the whole bottom off or cutting/drilling a hole in the case - neither option acceptable.
X1 carbon 2016 does not have an expressport slot. Here are the slots it has:
USB 3.0 HDMI (in) Mini Displayport (in) Onelink Dock
How would you hook in an eGPU into this laptop?