I've scoured the internet for hours, and can't find an answer to this question: Is it possible to run two 4k monitors at 60hz on a Macbook Pro? The only candidates appear to be the new 2015 13" rMBP with Iris 6100, or the 2014 15" rMBP with Iris Pro and the 750M graphics card. I've been given my choice of laptop for work, so I just want the one that will do this best. Obviously, this would be using the Thunderbolt ports, I'm aware this isn't possible with TB + HDMI. I've tested the 2015 13" and have confirmed it can drive a 4k monitor at 60hz, and a 2560 x 1600 monitor at 60hz at the same time. I've also heard that the Iris Pro can drive a 4k monitor at 60hz on its own, so theoretically that plus the 750M should work, right? I went to the Apple store and asked today, and got no answer. I'm amazed at Apple's lack of clarity in their specs on this matter. Anyone? I don't care if this will make graphics "choppy", I'm a software engineer so all I need is as much screen real estate as possible, I have no interest in smooth UI animations. I will most likely be using two Samsung U28D590D monitors in SST, since I already own one.