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MemoryMasters 4GB PC3-10600 DDR3 1333MHz 204 Pin CL9 SODIMM Memory Upgrade Module for 2011 MacBook Pro(all sizes), Mid 2010/2011 21.5" & 27" iMac (except 3.2GHz i3 Model) MD019G/A Equivalent - Walmart.com
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iMac "Core i3" 3.06 21.5" (Mid-2010) Specs (Mid-2010, MC508LL/A, iMac11,2, A1311, 2389): EveryMac.com
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A-Tech 16GB Kit (2x8GB) DDR3 1066MHz / 1067MHz PC3-8500 SODIMM RAM for Apple MacBook (13 inch, Mid 2010), MacBook Pro (13 inch, Mid 2010), iMac (27 inch, Late 2009), Mac Mini (Mid 2010) at Amazon.com
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