iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
iMac RAM for Model 11.2 to 12.2 | DDR3-1066MHz | 4GBx2 | MacMemory.com
Installing additional SSD in Mid-2010 27" iMac
Is it worth it to upgrade RAM on Mid 2010 21.5 iMac? | MacRumors Forums
Install memory in an iMac - Apple Support
Amazon.com: Timetec 32GB KIT(4x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for iMac (Mid 2010 27 inch, Mid 2011 21.5/27 inch) SODIMM Memory Module MAC RAM Upgrade for iMac 11,3 / iMac 12,1 / iMac 12, 2 : Electronics
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
Timetec Timetec 8Gb Kit(2X4Gb) Compatible For Apple Ddr3 1067Mhz / 1066Mhz Pc3-8500 Cl7 For Mac Book, Mac Book Pro, Imac, Mac Mini (Late 2008, Early/ Mid/Late 2009, Mid 2010) Sodimm Memory Mac Ram
32.0GB OWC Memory Upgrade Kit For 2010-2011 Apple iMac