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iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Amazon.com: A-Tech Components: Mid 2011 iMac
Best Buy: Apple 27" iMac All-in-One Computer 8 GB Memory 1 TB Hard Drive ME089LL/A
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
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com