Apple takes a complete product life cycle approach to determining our. We Buy and Sell Used Macs, Apple Computers and Refurbished Macs. iMac (Retina 5K, 27-inch, 2019) - Technical Specifications. Also, I bought this model specifically for graphic design and art reasons, which Mac displays have always been touted for, and it's very frustrating that people in this market especually might be getting screwed over when this is clearly a machine that would most benefit graphics people. Buy A Used Apple iMac Retina 5K 27-inch 3.0GHz Six-core i5 (Early 2019) MRQY2LL/A From. My concern is that this will get worse over time and that Apple won't do anything to fix the panel while I'm under warranty because of 'acceptable use' guidelines for display flaws (didn't buy Apple care initially as desktops are meant to need it less than portables. Apple weds high-res 5K visuals into its sleek 27' iMac with Retina 5K Display (Early 2019).With a 5120 x 2880 screen resolution, this iMac provides one billion colors and 500 nits of brightness. All iMac 27-Inch Models All 2015 Models Dynamically Compare This Mac to Others. I'm worried, as it occurred shortly after what appears to be a small cluster of dead pixels appeared on my screen (Apple support response: "on a Retina display iMac you shouldn't be able to see a single dead pixel" thanks I'm incredibly aware of that. Apple iMac 27-Inch 'Core i5' 3.2 (5K, Late 2015) Specs. I also just started noticing this problem.