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The iMac "Core i5" 3.0 21.5-Inch Aluminium (Retina 4K, Mid-2017/Kaby Lake) features a 14-nm "Kaby Lake" 3.0 GHz Intel "Core i5" processor (7400) with four independent processor "cores" on a single chip, a 6 MB shared level 3 cache, 8 GB of 2400 MHz DDR4 SDRAM that is reportedly onboard -- but actually can be upgraded later -- a 1 TB (5400 RPM) hard drive, and a Radeon Pro 555 graphics processor with 2 GB of dedicated VRAM. It also has a built-in "FaceTime HD" webcam and stereo speakers.
This model has a 21.5" 4096x2304 LED-backlit 16:9 widescreen IPS DCI-P3 "Retina 4K" display (that runs "pixel doubled" to look like 2048x1152). The rear of the case is aluminium and is thicker in the middle and tapers to a razor thin 5 mm at the edges.
Connectivity includes four USB 3.0 ports, dual Thunderbolt 3 (USB-C) ports, Gigabit Ethernet, 802.11ac Wi-Fi, and Bluetooth 4.2.
Compared to its predecessor, this model essentially has the same external enclosure, but it has a more advanced processor and architecture as well as dedicated graphics, a brighter display, and Thunderbolt 3 (USB-C) ports.
Retina 4K display 21.5-inch (diagonal) Retina 4K display 4096-by-2304 resolution with support for one billion colours 500 nits brightness Wide colour (P3) FaceTime HD camera Simultaneously supports full native resolution on the built-in display at millions of colours (21.5-inch) or 1 billion colours (21.5-inch 4K) and: One 5120‑by‑2880 (5K) external display at 60Hz with support for 1 billion colours, or Two 3840-by-2160 (4K UHD) external displays at 60Hz with support for 1 billion colours, or Two 4096‑by‑2304 (4K) external displays at 60Hz with support for millions of colours Thunderbolt 3 digital video output Native DisplayPort output over USB‑C Thunderbolt 2, HDMI, DVI, and VGA output supported using adapters (sold separately) Stereo speakers Microphone 3.5 mm headphone jack Support for Apple iPhone headset with microphone 3.5 mm headphone jack SDXC card slot Four USB 3 ports (compatible with USB 2) Two Thunderbolt 3 (USB-C) ports with support for: DisplayPort Thunderbolt (up to 40 Gbps) USB 3.1 Gen 2 (up to 10 Gbps) Thunderbolt 2, HDMI, DVI, and VGA supported using adapters (sold separately) 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector) Kensington lock slot Wi-Fi Bluetooth Line voltage: 100–240V AC Frequency: 50Hz to 60Hz, single phase Operating temperature: 50° to 95° F (10° to 35° C) Relative humidity: 5% to 95% noncondensing Operating altitude: tested up to 10,000 feet Height: 17.7 inches (45.0 cm) Width: 20.8 inches (52.8 cm) Stand depth: 6.9 inches (17.5 cm) Weight: 12.5 pounds (5.66 kg) iMac with Retina 5K display Apple Magic Keyboard Apple Magic Mouse Power cordDisplay Processor 3.0GHz
3.0GHz quad‑core Intel Core i5 (Turbo Boost up to 3.5GHz)Memory 8GB of 2400MHz DDR4 memory
Configurable to 16GB or 32GBGraphics Radeon Pro 560 with 4GB of VRAM Video Support and Camera Storage 256GB SSD Storage Audio Input/Output Wireless
802.11ac Wi-Fi wireless networking
IEEE 802.11a/b/g/n compatible
Bluetooth 4.2 wireless technologyElectrical and Operating Requirements Dimensions What’s in the Box