Upgrade your iMac's RAM in less than 5 minutes - YouTube
Installare la memoria in un iMac - Supporto Apple (IT)
How to Upgrade iMac RAM (21.5" and 27" Aluminum): EveryMac.com
PHS-memory 4Go de mémoire RAM pour Apple iMac Core i5 2.5GHz 21.5" (Mid 2011) DDR3 SO DIMM 1333MHz (Apple iMac Core i5 2.5GHz 21.5 pouces (mi 2011), 1 x 4GB) - digitec
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iMac RAM for Model 11.2 to 12.2 | DDR3-1066MHz | 4GBx2 | MacMemory.com
Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3L 1600MHz 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 price in UAE | Amazon UAE
4GB PC10600 DDR3 1333MHz SO-DIMM Memory Compatible with 2011 MacBook Pro, Mid 2010/2011 21.5" & 27" iMac Models, 2011 Mac Mini (OWC1333DDR3S4GB) at Amazon.com