A-Tech 8GB RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010 27 inch 4-Core, Mid 2011 21.5/27 inch), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Module at Amazon.com
CMS 16GB (4X4GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core I3 3.06 21.5-Inch (Mid-2010) - A28 at Amazon.com
iMac Intel 21,5" Mid 2010 EMC 2389 - used original spareparts for Macs
apple-history.com / iMac (Mid 2010)
How to Upgrade Memory in a 21.5-inch or 27-inch iMac (Mid 2010) - YouTube
Apple iMac 27-inch, Mid 2010 Memory 4 GB. Not Used Since 2015 | eBay
Apple iMac 2010 21.5" Refurbished All-In-One ( Microsoft Office and Ac – Upcycle Tech Foundation