If your fans are running fast after upgrading, you may not have reconnected one of the temperature sensors properly. No additional thermal cable is needed for all 21.5-inch 2012-onward iMacs.Follow this guide to perform the upgrade. To upgrade the factory 2.5-inch HDD, you’ll need the general servicing kit, plus a larger 2.5-inch HDD or 2.5-inch SSD. At the time of purchase, Apple offered a 1 TB "Fusion Drive" (which combines a 128GB ‘blade’ SSD and a 1 TB hard drive), or a stand-alone 256GB/512GB blade SSD. The iMac Mid 2014 21.5-inch iMac models have a standard 500GB 2.5-inch factory HDD with a 6 Gb/s SATA port.Sadly, the RAM is soldered to the motherboard in this model, and is not upgradeable.
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