I have a question. In my business we mainly run Macbook Pro Retina 15" all with top of the line GPUs (no on-board), and we run Dell U2414's 24" IPS & Dell P2715Q's (4k) ... so essentially we have 3 displays at each workstation. Now my question.... Would it benefit us performance wise to use the Macbook Pro's in clamshell mode vs making it run all 3 displays. Normally the only thing we use the Macbook Pro screen for is to keep iTunes up ... So what do you guys all do that run multiple displays on the Macbook Pro?