Is it worth it to upgrade RAM on Mid 2010 21.5 iMac? | MacRumors Forums
A-Tech 16GB (2x8GB) 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 Kit at Amazon.com
Install memory in an iMac - Apple Support
Memory RAM Upgrade for Apple iMac 21.5-inch Mid 2010 4GB DDR3 SODIMM | eBay
Installation de mémoire dans un iMac - Assistance Apple (FR)
Installation de mémoire dans un iMac - Assistance Apple (FR)