Mid 2011 Apple iMac 21.5" A1311 i5 2.7GHz 8GB RAM 1TB HD OSX Sierra - DCPS Computer Program
Install memory in an iMac - Apple Support
Apple iMac 11,2 A1311 21.5" AIO i3-550 3.20GHz CPU 4GB RAM 1TB HDD OSX 10.13 | eBay
A-Tech 16GB (2x8GB) 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 Kit at Amazon.com
iMac A1311 2010 21.5” Core i3 3.06GHz 4GB RAM 500GB HDD HD 4670 High Sierra FHD | eBay
Apple iMac model A1311 21.5 inch. 3.06 GHz Core i3 500GB HDD 4GB RAM OS High Sierra - Desktop Computers | Facebook Marketplace | Facebook