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
iMac "Core i5" 2.5 21.5" (Mid-2011) Specs (Mid-2011, MC309LL/A, iMac12,1, A1311, 2428): 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 at Amazon.com
CMS 16GB (4X4GB) DDR3 10600 1333MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core I5 2.5 21.5-Inch (Mid-2011) - A28 at Amazon.com
Corsair Apple Certified 16 GB (2x8 GB) DDR3 1600MHz (PC3 12800) Laptop Memory 1.35V at Amazon.com
Apple 10SOHYN1GB 1.0GB -Hynix Factory Original... at MacSales.com
Apple iMac 21.5″ Intel i3 (Late 2011) | Dynemac
Apple M471B5673FH0-CH9 2.0GB -Samsung Factory... at MacSales.com
CMS 16GB (2X8GB) DDR3 10600 1333MHZ NON ECC SODIMM Memory Ram Compatible with Apple Imac "Core I5" 3.1 27-Inch (Mid-2011) - A13 - Walmart.com
MacBook Pro 13" (Late 2011) 1600MHz Ram - Apple Community
Install memory in an iMac - Apple Support
A-Tech 4GB RAM for Apple MacBook Pro (Early/Late 2011), iMac (Mid 2010, Mid 2011, Late 2011), Mac Mini (Mid 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Module at Amazon.com
Amazon.com: Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac(Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) MAC RAM Upgrade :
A-Tech 16GB (4x4GB) RAM for Apple iMac (Mid 2010, Mid 2011, Late 2011) | DDR3 1333MHz PC3-10600 204-Pin SODIMM Memory Upgrade Kit at Amazon.com
NEMIX RAM 16GB (2x8GB Upgrade) DDR3-1333 PC3-10600 204-Pin SODIMM Memory for Apple MacBook Pro Early/Late 2011, iMac Mid 2010 27 inch 4-Core, iMac Mid 2011 21.5/27” , Mac Mini Mid 2011 at Amazon.com
Timetec Hynix IC 8GB KIT(2x4GB) Compatible for Apple DDR3 1333MHz PC3-10600 for Early/Late 2011 13/15/17 inch MacBook Pro, Mid 2010 Mid/Late 2011 21.5/27 inch iMac, Mid 2011 Mac Mini (8GB KIT(2x4GB)) - Walmart.com
32.0GB OWC Memory Upgrade Kit For 2010-2011 Apple iMac
![Used Apple iMac 21.5" Mid 2011 i5-2400S 4GB DDR3 RAM 500GB HDD El Capitan Tested | eBay](https://i.ebayimg.com/images/g/5IoAAOSwstliu0ug/s-l1600.jpg "Used Apple iMac 21.5" Mid 2011 i5-2400S 4GB DDR3 RAM 500GB HDD El Capitan Tested | eBay")
Used Apple iMac 21.5" Mid 2011 i5-2400S 4GB DDR3 RAM 500GB HDD El Capitan Tested | eBay
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
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Apple iMac A1312 12,2 (Mid-2011) 27" | 2.70GHz Core i5-2500S | 4GB DDR3 | DVD-RW | eBay
iMac RAM for Model 11.2 to 12.2 | DDR3-1066MHz | 24GB | MacMemory.com
Timetec Hynix IC 4GB Compatible for Apple DDR3 1333MHz PC3-10600 SODIMM Memory for Early/Late 2011 13/15/17 inch MacBook Pro, Mid 2010 and Mid/Late 2011 21.5/27 inch iMac, Mid 2011 Mac Mini (4GB) - Walmart.com
Amazon.com: Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac(Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) MAC RAM Upgrade :
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
iMac RAM for Model 11.2 to 12.2 | DDR3-1066MHz | 8GBx2 | MacMemory.com
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
![Apple 639-2347 21.5" 2011 iMac A1311 LGA 1155 DDR3 Logic Board | eBay](https://i.ebayimg.com/images/g/~2EAAOSwkwJjXDu2/s-l1600.jpg "Apple 639-2347 21.5" 2011 iMac A1311 LGA 1155 DDR3 Logic Board | eBay")