maxjstep

Stumbled on what a egpu is today, and came across this forum which seems to be an excellent resource in learning more about them. I have an early 2013 retina MacBook pro running Mac OS Sierra. I have the version with both Iris Pro Graphics and GT 650M and have been waiting for the new 2016 models to come out with Thunderbolt 3 and new graphics cards. My MacBook model was the last iteration to not be able to drive an external monitor at 4k 60hz, which I would also really like to be able to do. Would I be limited in doing an egpu setup with my current machine? It has Thunderbolt 1, I was wondering if that would be a significant bottleneck as it seems like most people are using Thunderbolt 2 with their egpu setups. I would also like to know if thunderbolt 3 is a major advantage with an egpu setup and if I should wait for the new MacBooks to come out. Will I be able to drive an external 4k monitor with a new powerful enough graphics card? And lastly, my ideal setup would be to use my Iris Pro/GT 650M on my built in display and then use something like a GTX980ti to run an external 4k monitor at the same time. I don't care about using the egpu to power my built in display, which I have read causes problems when you already have a discrete graphics card, but I would still like to be able to use it in a dual monitor setup for things like music production. Thanks for reading, look forward to any replies!