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chscag

 
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Member Since: Jan 23, 2008
Location: Fort Worth, Texas
Posts: 41,366
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Mac Specs: 27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, 3 iPods, Yosemite

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The maximum amount of memory for that machine is 2 GB. You need to buy 2 x 1GB modules and install them. That means removing both 256MB modules. See Nick's reply about ifixit and where to buy.

Don't mix modules, always use two of the same kind.
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