Kingston Technology 4 GB Memory for Select Apple Imac's and Macbooks Single (Not a kit) 1066 MHz (PC3 8500) 204-Pin DDR3 SO-DIMM KTA- MB1066/4G at Amazon.com
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Apple iMac Mid 2011 21.5-inch 2.7GHz Core i5 Apple DDR3 RAM Memory | Kingston
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OWC 8GB (2 x 4GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Compatible with 2011-2015 iMac, 2011-12 Mac Mini, and 2011-2012 MacBook Pro (Non-Retina Display) Models (OWC1600DDR3S08S) at Amazon.com
Kingston 4 GB Apple SODIMM iMac and MacBook Memory (Kit of 2) KTA-MB800K2/4G at Amazon.com
Memory RAM Upgrade for Apple iMac 21.5-inch Mid 2011 4GB/8GB DDR3 SODIMM | eBay
Memory RAM Upgrade for Apple iMac 21.5-inch Mid 2011 4GB/8GB DDR3 SODIMM | eBay
Memory RAM Upgrade for Apple iMac 21.5-inch Mid 2011 4GB/8GB DDR3 SODIMM | eBay
Kingston Technology 8GB Kit (2x4 GB Modules) 1066MHz DDR3 SODIMM Notebook Memory for Select Apple iMac's and Macbooks KTA-MB1066K2/8G at Amazon.com
Amazon.com: Kingston KCP316SD8/8 8gb 1600mhz Sodimm Mem : Home & Kitchen
New Sandisk SSD Plus on 2011 Macbook Pro … - Apple Community