Does anyone have experience with 4k displays? I have the very first gen retina macbook pro (15", early 2012). I'm thinking about buying a 4k display. This is my model: http://www.everymac.com/systems/app...-i7-2.3-15-mid-2012-retina-display-specs.html Looks like the DP in my model is too old (Thunderbolt 1). Did anyone have any luck with running a 4k display @ 60fps on this rmbp model?