How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
timetec 32gb kit(4x8gb) compatible for apple ddr3l 1600mhz pc3l-12800 cl11 for imac (mid 2011, late 2012, late 2013, late 2014 retina 5k, mid 2015 retina 5k) sodimm memory module mac ram upgrade - Walmart.com
32.0GB OWC Memory Upgrade Kit For 2010-2011 Apple iMac
Timetec 8GB Compatible for Apple DDR3L 1600MHz PC3L-12800 for Mac Book Pro (Early/Late 2011,Mid 2012), iMac(Mid 2011,Late 2012,Early/Late 2013,Late 2014,Mid 2015), Mac Mini(Mid 2011,Late 2012) MAC RAM at Amazon.com
Maximum memory for 2011 iMac - Ask Different
27" iMac Offers Easier RAM Upgrade
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
HOW TO: Upgrade The RAM to 32GB on a Mid-2011 21.5inch iMac - YouTube
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
8GB RAM Upgrade for 2011 MacBook Pro & Mac Mini Core i5 & i7 – $34 | OSXDaily
Timetec Hynix IC DDR3L 1600MHz PC3L-12800 SODIMM Compatible with Apple 2011, 2012, 2013, 2014 MacBook Pro, iMac, Mac mini (16GB Kit(2x8GB)) Laptop Memory - Newegg.com