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This iMac features a 14-nm "Broadwell" Quad Core processor with 4 independent processor "Cores" on a single chip. This range came in 4 different processor speeds, 1.6GHz i5, 2.8Ghz i5, 3.1Ghz i5 and 3.3GHz i7. This range is known as the 4K model, but only the top 2 specs came with the 4K display (the 3.1Ghz and the 3.3GHz models).
The base spec 1.6Ghz and 2.8Ghz models have a 21.5" 1920x1080 LED-backlit 16:9 widescreen IPS display, whereas the higher spec 3.1GHz and 3.3Ghz models have a 21.5" 4096x2304 LED-backlit 16:9 widescreen IPS DCI-P3 "Retina 4K" display, both with a fully laminated glass cover and an anti-reflective coating. The rear of the case is aluminum and is thicker in the middle and tapers to a razor thin 5 mm at the edges.