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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 40,956
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Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, Yosemite

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If you own a late 2009 iMac, it must either be a 21.5" or 27" model. In which case the maximum amount of memory for both machines is 16 GB.

However, the early and mid 2009 models all have a maximum memory of 8 GB. So which model do you have?

In any event which ever model you own, you can use 2 x 4 GB modules for a total of 8 GB. All the info I provided here is taken from Mactracker which is usually correct.
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