I'm looking at the just-refreshed early 2015 13" Retina Macbook Pro. Of note, it has two thunderbolt outputs and an HDMI output. I'd like to know definitively if it can drive three external displays (extending the desktop, not mirrored) while running in clamshell mode, or perhaps even four displays total including the built-in display. I can't seem to find this information anywhere in a data sheet or review. My limited understanding is that it can drive two displays through the thunderbolt outputs, and that perhaps if you daisy-chain an existing thunderbolt monitor to another one, my idea just might work. However, I have HDMI monitors. EDIT: I don't care about 4K, I just want HD resolution on multiple monitors and lots of screen real estate. It's not for gaming either. I work in a setting where I need to have a lot of windows open simultaneously to monitor things while I work on other stuff, etc.