[robhu]

It's not officially supported and so probably isn't a good business investment.

The Razer Core is (I believe?) the first non-chinese/ebay/type-thing solution that is officially meant to work on laptops (other than Razer or whoever makes the eGPU dock).

However I read a thread today saying someone who has one of these couldn't get it to work with the new 13" MBP. Don't know if that means it won't be possible in the future though. It's also very expensive ($400?) to add on top of the GPU.

[mikhailt]

TB3 is the first protocol to officially support eGPU by Intel.

As long as Apple doesn't block it outright in the EFI firmware, it should support eGPUs by default. If not, then Apple's the blame.