As a "configure-to-order" option for the iMac "Core i5" 3.1 or 3.7 27-Inch models, the iMac "Core i9" 3.6 27-Inch Aluminum (Retina 5K, 2019/Coffee Lake) is also listed separately for clarity. Except for the processor and its L3 cache, this model can be configured identically to its standard counterparts.
This iMac features a 14-nm "9th Generation" 3.6 GHz Intel "Core i9" processor (I9-9900K) with eight independent cores on a single chip, a shared 16 MB L3 cache, and 8 GB of user-upgradable 2666 MHz DDR4 SDRAM. It includes a 1 TB or 2 TB Fusion Drive and a Radeon Pro 575X or 580X graphics processor with 4 GB or 8 GB of dedicated GDDR5 video memory. A "FaceTime HD" webcam and stereo speakers are also integrated.
It sports a 27" 5120x2880 LED-backlit 16:9 widescreen IPS DCI-P3 "Retina 5K" display. The aluminum rear case tapers to a slim 5 mm at the edges. Connectivity consists of four USB 3.0 ports, dual Thunderbolt 3 (USB-C) ports, Gigabit Ethernet, 802.11ac Wi-Fi, and Bluetooth 4.2. It lacks a T2 chip.
Compared to its predecessor, this model is physically and internally very similar but boasts a more advanced processor, architecture, and graphics. The "2019" iMacs shipped with a compact aluminum Apple Magic Keyboard and "Magic Mouse 2". Upgrades were available for a "Magic Keyboard with Numeric Keypad" (US$30) and a "Magic Trackpad 2" (US$50), which added multi-touch and "Force Touch" capabilities.