4GB OWC DDR3L SO-DIMM PC3-12800 1600MHz CL11 Single Module
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
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OWC 16GB (2x8GB) PC3-12800 DDR3L 1600MHz SO-DIMM for Apple Mac Mini iMac | eBay
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Amazon.co.jp: Other World Computing OWC Memory Upgrade Kit Pc3 – 10600 MHZ SO-DIMM for iMac Mid 2010 Mid 2011 Macbook Pro 2011 Mac Mini 2011 Other : Computers
How-To: Boost your Mac's speed and prolong its useful life with easy RAM upgrades - 9to5Mac
OWC Announces Industry's First 16GB RAM Upgrade For Latest Apple MacBook Pro Models
OWC Internal SSD DIY Kit for All Apple 27-inch iMac 2011 Models (SSD Bay Add-In)
8.0GB(2x4GB) OWC Memory Upgrade For 27" iMac with Retina 5K Display (2017) - ynzal.com
How to upgrade RAM / Memory on a 2010 iMac Core i3 i5 i7 (21.5in & 27in) - YouTube