These models of the iMac continue to be produced today, although their design has not deviated much from the version released in 2012. The Retina model came with upgraded Thunderbolt ports and better spec options, along with the improved display synonymous with the Retina name. However, Apple released a 5th generation Retina iMac in October of 2014, to be produced alongside the non-Retina versions. The fourth generation continues to be produced, with the latest update having been announced in 2017. While the 21.5” version saw some decreases in repairability during this generation, the 27” model retained a service cover to allow the user to upgrade the RAM without removing the display and motherboard. In 2012, Apple slimmed down the iMac for the 4th generation, albeit at the expense of the SuperDrive optical drive.
The RAM slots are also doubled from the previous generation (from 2 to 4) along with the memory capacity (to 32GB). The plastic panel that made up the backs of the older generation is replaced with an aluminum enclosure which extends around the sides and front to form a single piece.
Not to be confused with the 21.5” version, this iMac measures 27 inches across opposite corners and came with options for the Intel i-series chips not available initially in the smaller version. The first unibody iMac was released in October of 2009, replacing the 20 and 24 inch versions of the second generation.
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