Samuel Axon, writing for Ars Technica:
We tested an eGPU enclosure with a Thunderbolt 3-equipped MacBook Pro, and found that, in most applications, performance didn’t disappoint. Unfortunately, we also found limitations and software support inconsistencies that prevent the Mac eGPU dream from being fully realized at this time.
This is an extremely tempting solution. I imagine my current setup changing from a Hackintosh and MacBook Pro 13” to just a MacBook Pro 13” with a eGPU setup and external monitor. There would be a few caveats: I’d need a 2 TB SSD in the MacBook, at least a 4K monitor, preferably supporting Display P3 (my current 4K Eizo is sRGB), and I’d want one of those new quad-core Core i7s from Intel. They’re already available but Apple hasn’t yet ingested them into the lineup.
That and a reliable keyboard — my MacBook Pro is currently in for service for a new one.