A-Tech 16GB Kit (2x8GB) DDR3 1066MHz / 1067MHz PC3-8500 SODIMM RAM for Apple MacBook (13 inch, Mid 2010), MacBook Pro (13 inch, Mid 2010), iMac (27 inch, Late 2009), Mac Mini (Mid 2010) at Amazon.com
Install memory in an iMac - Apple Support
How to Upgrade Memory in a 21.5-inch or 27-inch iMac (Mid 2010) - YouTube
iMac 27" Mid 2010 i7 CPU 20GB ram 1TB HD, OSX High Sierra, 4k USB camera giving garbage pattern on camera feed to Lightburn - LightBurn Hardware Compatibility - LightBurn Software Forum
iMac 27" Mi 2010 - Intel i3 3,2 GHz 8 Go RAM Reconditionné | Occasion
Installing additional SSD in Mid-2010 27" iMac
Apple iMac 27-inch (July 2010) review: Apple iMac 27-inch (July 2010) - CNET