I am converting from a 27 Imac to a 15 inch Macbook Pro Retina and I would like to get an external 4k monitor running at 60 Hz. I have read that with Yosemite beta some folks are able to get 4k and 60hz with both the Iris Pro and the NVIDIA GeForce GT 750M. I would love to get one of the late 2013 2.0GHz, 8gb ram, 256 flash storage deals going on now but I am not sure if with this configuration and trying to push the display if I will run into issues. I will be mainly use the computer for Graphic Design, Photoshop and a little Video. Does anyone have a similar set up and are they able to get either the Samsung U28D590D or the Dell UP2414Q to work without any issues?