Basic Apple iMac with High Sierra OS | i-series processor | 4 Gb memory — Free Geek Twin Cities
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
16GB Memory Upgrade Kit For Apple iMac 2010-2011
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
Crucial 4GB DDR3L-1333 SODIMM Memory for Mac | CT4G3S1339M | Crucial.com
OWC 8GB (2 x 4GB) PC12800 DDR3L 1600MHz SO-DIMMs Memory Compatible with 2011-2015 iMac, 2011-12 Mac Mini, and 2011-2012 MacBook Pro (Non-Retina Display) Models (OWC1600DDR3S08S) at Amazon.com
Apple iMac 21.5" Mid 2011 A1311 Core i5 2.5GHz 4GB RAM 500GB HDD *READ* F – I.E.T. INDUSTRIAL ANTONIO PRIETO – SINCELEJO, SUCRE
Apple iMac 21.5" All-in-One Desktop Computer i3 3.07GHz 4GB Ram 500GB Mac OS High Sierra w/ Keyboard & Mouse - GRADE B
Apple iMac 21.5 Inch Mid 2011 A1311 Core i5 2.5Ghz 4GB 500GB HDD OSX 1 – NT Electronics LLC
Apple iMac A1311 21.5" AiO Computer i5-2400S (Mid-2011) -
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
Apple iMac 2011 Memory 4GB DDR3 1333MHz PC3-10600 204-Pin