Quote Originally Posted by faceoff View Post
monitor datapath in load
2.5k@60 4k@30 8-50% (various)
2.5k@60 4k@25 10-30-60-90~100% (spasmodically)
2.5k@60 fHD@50 10-40% (various)
2.5k@60 fHD@60 8-40% (various)
fHD@50 4k@25 3-5%
fHD@60 4k@30 3-5%
/
you know which physical display outputs you connected monitors to?
you aware of the physical ordering of the thunderbolt busses?


display_ports.png

http://support.apple.com/en-us/HT202801