iMac (Retina 5K, 27-inch, Late 2015) - Technical SpecificationsDisplay27-inch (diagonal) Retina 5K display with IPS technology5120‑by‑2880 resolution with support for millions of colorsProcessor 4.0GHz quad-core Intel Core i7 (Turbo Boost up to 4.2GHz)Memory8GB (two 4GB) of 1867MHz DDR3 memory; four SO-DIMM slots, user accessibleConfigurable to 16GB or 32GBStorage13.3GHz2TB Fusion DriveConfigurable up to 3TB Fusion Drive or 256GB, 512GB, or 1TB of flash storage (SSD)GraphicsAMD Radeon R9 M390 graphics processor with 2GB of GDDR5 memoryVideo Support and CameraFaceTime HD cameraSimultaneously supports full native resolution on the built-in display and up to two 4096-by-2160 external displays or one 5120-by-2880 dual-cable external displaySupport for extended desktop and video mirroring modesAudioStereo speakersDual microphones3.5 mm headphone jackHeadphone/optical digital audio output (minijack)Support for Apple iPhone headset with microphoneConnections and Expansion3.5 mm headphone jackSDXC card slotFour USB 3 ports (compatible with USB 2)Two Thunderbolt 2 portsMini DisplayPort outputSupport for HDMI, DVI, VGA, and dual-link DVI (adapters sold separately)10/100/1000BASE-T Gigabit Ethernet (RJ-45 connector)Kensington lock slotInputMagic KeyboardThe redesigned Magic Keyboard comes standard with your iMac. It’s wireless and rechargeable (so you won’t be replacing batteries), with an ultracompact, edge-to-edge design that wastes no surface space. It has an improved scissor mechanism, optimized key travel, and a lower profile that increase control and comfort. And it pairs immediately with your iMac right out of the box.Magic Mouse 2The new design of Magic Mouse 2 lets it glide more smoothly across your desk. And since it supports Multi-Touch, you can use simple gestures on its surface to do things such as swipe between web pages and scroll through documents. So if you prefer to use a wireless mouse but want some of the benefits of Multi-Touch, Magic Mouse 2 is a great choice.Magic Trackpad 2If you prefer using a trackpad, Magic Trackpad 2 gives you the full range of Multi-Touch gestures and introduces Force Touch to the desktop. Sensors underneath the trackpad surface detect subtle differences in the amount of pressure you apply, bringing more functionality to your fingertips and enabling a deeper connection to your content. This new design, along with a lower profile, makes it even more comfortable to use.WirelessWi-Fi802.11ac Wi-Fi wireless networkingIEEE 802.11a/b/g/n compatibleBluetoothBluetooth 4.0 wireless technologySize and Weight27-inch iMacHeight: 20.3 inches (51.6 cm)Width: 25.6 inches (65.0 cm)Stand depth: 8 inches (20.3 cm)Weight: 21 pounds (9.54 kg)227-inch iMac with built-in VESA adapterHeight: 17.6 inches (44.7 cm)Width: 25.6 inches (65.0 cm)Depth (including built-in VESA adapter): 3.1 inches (7.9 cm)Electrical and Operating RequirementsLine voltage: 100–240V ACFrequency: 50Hz to 60Hz, single phaseOperating temperature: 50° to 95° F (10° to 35° C)Relative humidity: 5% to 95% noncondensingOperating altitude: tested up to 10,000 feet