Mac Mini Memory for Model 4.1 | DDR3 1066MHz | 2010 | Ramjet.com
Amazon.com: Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3L 1600MHz for Mac Book Pro(Early/Late 2011,Mid 2012), iMac(Mid 2011,Late 2012,Early/Late 2013,Late 2014,Mid 2015), Mac Mini(Mid 2011,Late 2012) MAC RAM : Electronics
How to Upgrade Memory in a 21.5-inch or 27-inch iMac (Mid 2010) - YouTube
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com