Hi. I know this might be a silly question but I am really thinking about purchasing a 4K 24-inch display, Dell UP2414Q for my 2011 MBP with AMD 6490M graphics. I want to get "retina" effect using HiDPI mode in the OS X. I know it is not possible to run the 4K display at 60Hz, but I was wondering if it is possible to get a 3840x2160@30Hz. Any suggestion will be much appreciated. Thank you!