The 27-inch iMac 5K was announced as a significant revision ... to house the internal components and a prominent chin under the screen. Despite a pixel-dense screen and ever-more-powerful graphics ...

Original story: A late-2014 display hooked to an early 2012 GPU The GPU powering the 27-inch iMac with Retina 5K display is the R9 M290X, with the R9 M295X offered as an optional upgrade.

Our tech reviewer always wanted a new iMac, and testing the M4 model has shown him the ups and downs of Apple’s latest ...