Apple iMac 27" 5K Retina Quad Core i7 4.0GHz late-2015

Specs at a Glance:

• 27-inch DCI-P3 "Retina 5K" Resolution LED-backlit display (5120*2880 resolution)
• Intel Core i7 4.0GHz quad-core "Skylake" processor
• 32GB DDR3 RAM
• 1TB Solid State Drive
• AMD Radeon R9 M395x 4GB Graphics
• FaceTime HD Camera
• Four USB 3, two Thunderbolt 2 (Airplay supported), Gigabit Ethernet and SDXC card slot
• Wi-Fi 802.11ac and Bluetooth 4.0
• macOS 10.13 High Sierra
• Apple Wireless Keyboard and Magic Mouse

More spec details below, courtesy of our friends at EveryMac.

The iMac "Core i7" 4.0 27-Inch Aluminum (Retina 5K, Late 2015/Skylake) features a 14-nm "Skylake" Quad Core 4.0 GHz Intel "Core i7" processor (6700K) with four independent processor "cores" on a single chip, an 8 MB shared level 3 cache, 8 GB of 1867 MHz LPDDR3 SDRAM (PC3-14900) installed in pairs (two 4 GB modules), a 1 TB or 2 TB "Fusion Drive," and an AMD Radeon R9 M390 or AMD Radeon R9 M395 graphics processor with 2 GB of dedicated GDDR5 memory. It also has a built-in "FaceTime HD" webcam and stereo speakers.

This model has a 27" 5120x2880 LED-backlit 16:9 widescreen IPS DCI-P3 "Retina 5K" display. The rear of the case is aluminum 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 2 ports, Gigabit Ethernet, 802.11ac Wi-Fi (802.11a/b/g/n compatible), and Bluetooth 4.0.

Compared to its predecessor, this model essentially has the same external enclosure, but it has a higher quality DCI-P3 "Retina 5K" display with a wider color gamut as well as a more advanced architecture and graphics architecture.