Finish	21-inch	27-inch

Display	21.5-inch (diagonal) LED-backlit display with IPS technology; 1920x1080 resolution with support for millions of colours Retina 4K display 21.5-inch (diagonal) Retina 4K display with IPS technology; 4096x2304 resolution with support for millions of colours	Retina 5K display 21.5-inch (diagonal) Retina 5K display with IPS technology; 5120x2880 resolution with support for millions of colours

Processor	1.6GHz 2.3GHz dual-core Intel Corei5 (Turbo Boost up to 2.7GHz) 2.8GHz 3.6GHz quad-core Retina 4K display Intel Corei3 processor (Turbo Boost up to 3.3GHz) 3.1GHz 24-inch iMac with Retina 4.5K display: Apple M1 chip with 8 core CPU and 7 core GPU, 256GB - Silver (Turbo Boost up to 3.6GHz) Configurable to 3.3GHz quad-core Intel Core i7 (Turbo Boost up to 3.8GHz)	3.2GHz 3.0GHz quad-core Retina 4K display Intel Corei5 processor (Turbo Boost up to 3.6GHz) 3.2GHz 24-inch iMac with Retina 4.5K display: Apple M1 chip with 8‑core CPU and 8‑core GPU, 256GB - Silver Configurable to 4.0GHz quad-core Intel Core i7 (Turbo Boost up to 4.2GHz) 3.3GHz 3.0GHz Retina 5K display 6-core 8th-generation Intel Corei5 Configurable to 4.0GHz quad-core Intel Core i7 (Turbo Boost up to 4.2GHz)

Memory	8GB of 1867MHz LPDDR3 onboard memory Configurable to 16GB	8GB (two 4GB) of 1867MHz DDR3 memory; four SO-DIMM slots, user accessible Configurable to 16GB or 32GB

Storage	1TBTB 1TB (5400-rpm) hard drive Configurable up to 1TB Fusion Drive or 256GB of flash storage (SSD) 1TB 1TBTB (5400-rpm) hard drive Configurable up to 1TB Fusion Drive or 256GB of flash storage (SSD) 1TB 256GB (5400-rpm) hard drive Configurable up to 256GB Fusion Drive or 256GB of flash storage (SSD)	1TB 1TB (7200-rpm) hard drive Configurable up to 1TB Fusion Drive or 256GB of flash storage (SSD) 1TB 256GB Fusion Drive Configurable up to 3TB Fusion Drive, or 256GB, 512GB or 1TB of flash storage (SSD) 1TB 2TB Fusion Drive Configurable up to 3TB Fusion Drive, or 256GB, 512GB or 1TB of flash storage (SSD)

Size and Weight	Height: 45.0 cm (17.7 inches) Width: 52.8 cm (20.8 inches) Stand depth: 17.5 cm (6.9 inches) Weight: 5.68 kg (12.5 pounds)2	Height: 51.6 cm (20.3 inches) Width: 65.0 cm (25.6 inches) Stand depth: 20.3 cm (8.0 inches) Weight: 9.54 kg (21 pounds)

Graphics	Intel HD Graphics 6000 Intel Iris Pro Graphics 6200 Intel Iris Pro Graphics 6200	AMD Radeon R9 M380 graphics processor with 2GB of GDDR5 memory AMD Radeon R9 M390 graphics processor with 2GB of GDDR5 memory AMD Radeon R9 M395 graphics processor with 2GB of GDDR5 memory Configurable to AMD Radeon R9 M395X with 4GB of GDDR5 memory

Wireless	Wi-Fi 802.11ac Wi-Fi wireless networkingIEEE 802.11a/b/g/n compatible Bluetooth Bluetooth 4.0 wireless technology	Wi-Fi 802.11ac Wi-Fi wireless networkingIEEE 802.11a/b/g/n compatible Bluetooth Bluetooth 4.0 wireless technology

Connections and Expansion	3.5mm headphone jack SDXC card slot Four USB 3 ports (compatible with USB 2) Two Thunderbolt 2 ports Mini DisplayPort output Support for HDMI, DVI, VGA and dual-link DVI (adapters sold separately) 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector) Kensington lock slot	3.5mm headphone jack SDXC card slot Four USB 3 ports (compatible with USB 2) Two Thunderbolt 2 ports Mini DisplayPort output Support for HDMI, DVI, VGA and dual-link DVI (adapters sold separately) 10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector) Kensington lock slot

Video Support and Camera	FaceTime HD camera Full native resolution on the built-in display and up to 3840x2160 pixels, 4096x2304 pixels on an external display Support for extended desktop and video mirroring modes	FaceTime HD camera Simultaneously supports full native resolution on the built-in display and up to two 4096x2160 external displays or one 5120x2880 dual-cable external display Support for extended desktop and video mirroring modes

Audio	Stereo speakers Dual microphones 3.5mm headphone jack Headphone/optical digital audio output (mini-jack) Support for Apple iPhone headset with microphone

Operating System	OS X El Capitan Engineered to take full advantage of your Mac hardware, OS X El Capitan is designed to be as easy to use as it is beautiful to look at. It comes with an amazing collection of apps you'll use - and love - every day. And it enables your Mac and iOS devices to work wonderfully together

In the box	21.5-inch iMac or 21.5-inch iMac with Retina 4K display Magic Keyboard Magic Mouse 2 Power lead Lightning to USB Cables	iMac with Retina 5K display Magic Keyboard Magic Mouse 2 Power lead Lightning to USB Cable

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