MacBook Pro Retina (MBPr) running 8 external displays on one Thunderbolt connection
With two eGPUs (1. GTX 970 ; 2. GTX980Ti) I was able to run 7 displays (one of them connected two times to be recognized two times = 8 external displays for OSX). All on one TB port! eGPUs running daisy chained. See my build here: http://forum.techinferno.com/implementation-guides-apple/9821-2014-15-mbp-iris-gtx970%4016gbps-tb2-akitio-thunder2-win8-1-osx10-10-%5Bdschijn-2%5D.html
With two eGPUs (1. GTX 970 ; 2. GTX980Ti) I was able to run 7 displays (one of them connected two times to be recognized two times = 8 external displays for OSX). All on one TB port! eGPUs running daisy chained. See my build here: http://forum.techinferno.com/implementation-guides-apple/9821-2014-15-mbp-iris-gtx970%4016gbps-tb2-akitio-thunder2-win8-1-osx10-10-%5Bdschijn-2%5D.html