The iMac "Core i5" 3.5 27-Inch Aluminum (Retina 5K, Mid-2017/Kaby Lake) features a 14-nm "Kaby Lake" 3.5 GHz Intel "Core i5" processor (7600) with four independent processor "cores" on a single chip, a 6 MB shared level 3 cache, 8 GB of easy to upgrade 2400 MHz DDR4 SDRAM, a 1 TB Hard Drive+SSD "Fusion" drive, and a Radeon Pro 575 graphics processor with 4 GB of dedicated VRAM. It also has a built-in "FaceTime HD" webcam and stereo speakers.<br>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.<br>Connectivity includes four USB 3.0 ports, dual Thunderbolt 3 (USB-C) ports, Gigabit Ethernet, 802.11ac Wi-Fi, and Bluetooth 4.2.<br>Compared to its predecessor, this model essentially has the same external enclosure, but it has a more advanced processor and architecture, a brighter display, and Thunderbolt 3 (USB-C) ports.