I currently own a MacBook Pro 13 inch Late model 2013 with the following specs: 2.6 Intel I5 8 GB Memory Intel Iris Graphics Card 1536 MB 512 GB SSD All this is hooked up to a Dell U2414H Monitor at 1920 X 1080 @ 60 Hz. using the display port cable. With the current prices of high resolution monitors, I am considering an upgrade to a 4K monitor but my research is giving me mixed results. At best I'm told I can but have to settle for editing at 30 Hz. I do not do video, only photo editing using Photoshop. It appears the MacBook Pro 15 inch Late model 2013 does work at 60 Hz but is using a Intel Iris PRO graphics card. My other option is just upgrading to a monitor at 2560 X 1440 resolution but would love 4K if its possible. Any input will be much appreciated and thanks for your time.