Apple iMac (2017):Apple weds high-res 5K visuals into its sleek, 5mm thin 27" iMac with Retina 5K Display. With a 5120 x 2880 screen resolution, The Retina 5K display also features a wider color gamut. Using a P3-based color gamut, the Retina 5K display provides a larger color space that more equally represents red, green, and blue, as compared to standard sRGB displays.