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MacBook Pro: How to remove or install memory - Apple Support
A-Tech 8GB (2x4GB) RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010, Mid 2011, Late 2011), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
MacBook Pro Retina A1502 memory upgrade in Ganeshguri Archives - iFix Guwahati