New 21.5-inch iMac least repairable yet due to lack of RAM, hard drive upgradability - 9to5Mac
OWC Tears Down Late 2015 27-Inch iMac 5K mk482ll/a
Probably of no use to anyone here, but the 2.8GHz late 2015 iMac logic board requires a different heatsink than the 1.6GHz board because the CPU is in a different location. Ask
2015 27-inch iMac with Retina 5K display review | Should I buy an iMac? | Macworld
imac 2015 4K SSD 21.5インチ marz.jp
Apple's 4K 21.5-Inch iMac Allows You to Upgrade RAM and CPU – Company Finally Dialing Down on Soldered Components, Reveals Teardown