In October 2012, Apple introduced the current iMac, bringing the now-familiar unibody-aluminum design of the MacBook Air line to the desktop. This new iMac boasted a considerably thinner body that made it sleek, elegant, and refined—right up until you need to open up the device for upgrades or repairs. Alas, the only way into the machine is through the front glass, which is affixed to the rear case with tape, and the CPU and hard drive are buried deep behind this adhesive curtain.
Fortunately for the would-be upgrader, the 27-inch iMac has an easy-access door for RAM upgrades. Unfortunately, the 21.5-inch version is missing even that—on this model, Apple doesn’t consider RAM to be a user-serviceable part. Plus, the 21.5-inch iMac’s RAM slots are inconveniently located behind the logic board, so a DIY upgrade means gutting the whole computer.