With 27” Display (diagonal) Retina 5K Display, a resolution of 5120 x 2880 that supports for one billion of colors and a 500 nits brightness with Wide color (P3). This iMac simultaneously supports full native resolution on the built-in display at 1 Billions of colors and: One 5120‑by‑2880 (5K) external display at 60Hz with support for 1 billion colors, or Two 3840-by-2160 (4K UHD) external displays at 60Hz with support for 1 billion colors, or Two 4096‑by‑2304 (4K) external displays at 60Hz with support for millions of colors.
The Processor on this iMac 27” Early 2019 was upgraded with an 8th Generation 3.1 GHz Intel Core i5 6-Core Processor that can be boost up to 4.3 GHz for a better and fast performance.
The Ram “Memory” with an 8GB of 2666 MHz DDR4 RAM in a 2 x 4GB module that can be upgraded up to 64GB with each 4 x 16GB module in each of the four SO-DIMM slots.
The Ports on this iMac are; (Four) USB 3 ports (compatible with USB 2), SDXC card slot, 3.5 mm headphone jack, 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector), (Two) Thunderbolt 3 (USB-C) ports with support for: ( Display port; Thunderbolt (up to 40Gb/s); USB 3.1 Gen 2 (up to 10gb/s); Thunderbolt 2, HDMI, DVI and VGA supported using adapters (Sold Separately).