Apple iMac A1418 4K Late 2015 i7 5775R 3.3GHz 16GB 256GB SSD 21.5" | 3mth Wty

The iMac "Core i7" 3.3 21.5-Inch Aluminum (Retina 4K, Late 2015/Broadwell) technically is a "configure-to-order" configuration of the iMac "Core i5" 3.1 21.5-Inch Aluminum (Retina 4K, Late 2015/Broadwell), but also is documented as a separate model for reader convenience. Other than processor (and the corresponding level 3 cache), these two models are identical.

The iMac "Core i7" 3.3 21.5-Inch Aluminum (Retina 4K, Late 2015/Broadwell) features a 14-nm "Broadwell" Quad Core 3.3 GHz Intel "Core i7" processor (5775R) with four independent processor "cores" on a single chip, a 6 MB shared level 3 cache, 8 GB of onboard 1867 MHz LPDDR3 SDRAM (which could be upgraded to 16 GB at the time of order, but cannot be upgraded after system purchase at all), a 1 TB (5400 RPM) hard drive, and an "integrated" Intel Iris Pro 6200 graphics processor that shares system memory. 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 "Retina 4K" display (that runs "pixel doubled" to look like 2048x1152). 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.