Hi, I'm about to order a new Mac Mini, high-end spec with SSD storage. If I've understood properly it's possible to set the display to 4K resolution at 30 HZ and even 50HZ? To set it at 50HZ do I need to use the switchresx app or can I do it without any external app? Can anyone please recommend some 4K displays? I'm interested in Dell and Samsung but am open to suggestions. I read that the colours on a Dell might not be very bright? And I am guessing on a Samsung they are quite intense like their tvs? I am looking for a 27-28" display. Also, if the 4K is set to 30Hz or 50Hz will it be too choppy in general use or does it depend on what you are doing on the monitor? E.g. if I am only browsing or doing microsoft office stuff or going through iPhoto, will it be ok or will it stutter like crazy?! And how is the performance if I am watching proper 4K content from youtube? Thanks!