I'm thinking about replacing my 2007 MBP 17" with a late-2013 or mid-2014 MBP 15" iGPU-only model (as that's my max budget). With the option to add an external monitor for (basic) photo-editing in the future. Looking at https://everymac.com/systems/apple/...iris-only-late-2013-retina-display-specs.html and https://everymac.com/systems/apple/...-iris-only-mid-2014-retina-display-specs.html a 4k (3840x2160) external monitor could only run @30Hz. Could anyone confirm that or has anyone managed to run it @60Hz? Also, would the iGPU-only version (with 128MB eDRAM) be able to smoothly run a 4k external monitor for (basic) photo-editing (no video nor gaming)? --- Post Merged, Jan 12, 2018 --- alternatively, what about the 15" 2015 iGPU-only model(s)?