Apple 21 inch iMac has 5th Gen 2.8GHz dual-core Intel Core i5 (Turbo Boost up to 3.3GHz) with 4MB shared L3 cache with integrated Intel Iris Pro Graphics 6200. It has 21.5″ LED-backlit 16:9 widescreen TFT active matrix display with IPS technology and a native resolution of 1920×1080.
It comes in configuration of 8GB (4GB x 2) of 1867MHz LPDDR3 onboard memory. It has 1 TB of Mechanical SATA hard drive with 5400rpm. This laptop comes pre-loaded with OS X 10.11 “El Capitan” compatible for upgrading to macOS Mojave (10.14). Other features include WiFi 802.11 ac, Bluetooth 4.0, 4 USB 3.0 ports, 2 Thunderbolt 2 ports, Gigabit Ethernet, SDXC SD Card Reader and a 3.5mm headphone jack.