The site used a 27" EMC 2639 model for the teardown featuring a 3.2GHz quad-core Intel Core i5 processor (Turbo Boost up to 3.6GHz) with 6MB L3 cache, NVIDIA GeForce GT 755M graphics processor with 1GB of GDDR5 memory, 802.11ac Wi-Fi, and PCIe flash SSD option.
Notably, iFixit found that the 21.5-inch version of the iMac had a soldered CPU. Thankfully the 27-inch version does not.
iMac 27" EMC 2639 Repairability Score: 5 out of 10 (10 is easiest to repair)
● RAM is user-replaceable without opening the case, thanks to the rear access door.
● You can still replace the hard drive and CPU inside this machine, albeit with some adhesive cutting.
● Components are modular and fairly easy to remove.
● Budget-minded folks now can add a second hard drive to the base iMac because the Fusion Drive connector is no longer missing from the logic board.
● The glass and LCD are fused together, and there are no more magnets holding the glass in place.
● You'll have to masterfully peel off the old double-sided sticky tape and apply new tape in order to reseal this iMac into original condition.