Hi Mac Experts, I'd like your help to understand if my planned computer setup for work will work. I have a decent budget ($3,000) to buy the equipment I want and I'd love some confirmation that this set up will 1. work 2. work well under intense use (CPU/memory heavy work) I'm deciding between the 13" and 15" rMBP. I have a late 2012 15" (first retina MBP) and I would really prefer to get a more portable 13" since I travel quite a bit and the 15 is rather heavy. I've specced out the following 2015 rMBP on the Apple site: - 3.1GHz Dual-core Intel Core i7, Turbo Boost up to 3.4GHz - 16GB 1866MHz LPDDR3 SDRAM - 512GB PCIe-based Flash Storage Yes it's maxed out! I do data analytics/science and dev. work that tends to be RAM and CPU intensive so it's nice to have the power. I'd love to be able to hook this laptop up to 2 24" external 4k displays at a "retina" like DPI/PPI level. In my research, I found this great comment by user MTW in the WireCutter article that explains that the Dell P2415Q is the best plug/play 4k display for the money. My concerns/questions are: Does the 2015 13" rMBP support 4k @ 60 hz with the Dell monitor? Can I do so in clamshell mode and using the laptop screen as a second screen? I've done a search on here and saw some posts where people said it worked and others who couldn't get it to work. This might be greedy but does it support 4k @ 60hz with 2 4k Monitors at once in clamshell mode? Will that kill my performance if I'm doing intensive data science/analysis work? That kind of work isn't GPU intensive but I'm not sure if that matters. I'd rather use a single monitor than deal with frequent slow downs with a dual monitor set up. Is the Dell P2415Q the best 4k monitor for the price? I'd prefer to be at 24" or under to maximize PPI and "retina" level clarity. According to this: http://www.noteloop.com/kit/display/pixel-density/ I'll get 185 PPI at 24" which is a slight compromise over the 227 I'll get with the 13" monitor. Not sure if it makes sense to go smaller (23" or 21.5" or if I'll even detect the difference at a distance of 2 feet) I'm open to any suggestions on how to get the best performance set up here. Very grateful for your help and recommendations. Thank you and take care.