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A-Tech 32GB (4x8GB) RAM for Apple iMac (Mid 2010 27 inch 4-Core, Mid 2011 21.5/27 inch) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
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iMac "Core i3" 3.2 21.5" (Mid-2010) Specs (Mid-2010, MC509LL/A, iMac11,2, A1311, 2389): EveryMac.com
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