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Q: Question. IMac 21.5inch, mid 2011 memory upgrade.
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Feb 1, 2014 12:25 PMby Baby Boomer (USofA),If the instructions are not in the OS Help menu, look up your model iMac's user manual for RAM installation instructions: http://support.apple.com/manuals/: User & DIY (Do-It-Yourself) Manuals
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Feb 1, 2014 1:10 PMby babowa,
From here:
http://support.apple.com/kb/HT1423?viewlocale=en_US#4
I'd add 2 x 4 GB in the two bottom slots for a total of 12.
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