The Retina iMac can be further upgraded to a 4GHz quad-core Intel Core i7, 32GB of RAM a 3TB Fusion Drive or 1TB SSD ... that has four times the bandwidth of the previous generation 27-inch iMac. The ...
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.
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