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How do I know how much RAM to get?

I currently have a mid 2011 21.5" iMac running Mountain Lion with 8G of RAM. I want to exapnd this to 16G but i am not sure of how many slots I have available for extra RAM. Should I get one 8G card or two 4G cards? Can anyone assist?

iMac (21.5-inch Mid 2011), Mac OS X (10.7.4)

Posted on Nov 15, 2012 6:38 PM

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How do I know how much RAM to get?

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