https://www.cnet.com/news/razer-core-x-chroma-egpu-brings-back-the-rainbow/

Razer says the box actually has two Thunderbolt controllers to maintain the stability of the single connection since it's handling both data and video signals. You can also charge most laptops -- up to 100 watts -- through it.

An eGPU is the only way to bring a MacBook Pro up to workstation-class specs or to turn a potato Windows laptop, albeit one new enough to have a USB-C/Thunderbolt connection, into a ray-tracing wunderkind. (Well, it takes a lot more than a new GPU to do that, but you get the point.)