HT201191: Install memory in an iMac
Learn about Install memory in an iMac
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Helpful answers
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Jun 2, 2016 7:22 AM in response to JESUSby padams35,RAM in the 21" 2013 iMacs is officially listed as Not User Serviceable. It can be done, but the process requires significant disassembly and is reputedly even harder than an internal hard drive replacement.
It is highly recommended that memory upgrades on your model be performed only by an Apple Authorized Service Provider.