Updated eGPU guide with 2015 Macbook Pro 15" : r/eGPU
eGPU with Mac Book Air 2015 - Graphics Cards - Linus Tech Tips
External GPU worth it for Video Editors? Macbook Pro + eGPU vs 5K iMac - YouTube
display - When using an external monitor, does a mid-2015 Retina Macbook Pro with only integrated graphics run cooler than one with discrete graphics? - Ask Different