How to: 27-inch 5K iMac (2019) 128GB RAM Upgrade - Save $$$! - YouTube
Amazon.com: 2013 Apple iMac with 3.2GHz Intel Core i5 (27-inch, 8GB 1TB Mac OS X) (Renewed) : Electronics
iMac RAM Upgrade mixing different memory sticks: 27” iMac late 2013 - YouTube
21.5" iMac Has No User-Upgradable RAM; 27" Has Four Accessible RAM Slots - MacRumors
Install memory in an iMac - Apple Support
How to Upgrade Memory in a 27-inch iMac (Late 2012-2013) iMac13,2 and iMac14,2 - YouTube
Memory upgrade: Apple iMac 2012/2013/2014 (Howto)
Apple iMac 27" Late 2013 A1419 Logic Board i5 3.2GHz 775M 1GB 661-7516 | MacKing
iMac (27-inch, Late 2013) 1TB SSD Upgrade - NiwTech
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Install memory in an iMac - Apple Support
Intel imac 27 late 2013 ssd upgrade | sarahmenamores1985's Ownd
A-Tech 8GB RAM for Apple MacBook Pro (Mid 2012), iMac (Late 2012, Early/Late 2013, Late 2014, Mid 2015), Mac Mini (Late 2012) | DDR3 1600MHz PC3-12800 SODIMM 204-Pin Memory Upgrade at Amazon.com
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
Memory Upgrades for iMac 21.5-Inch 2012 - Late 2013
CMS 16GB (2X8GB) DDR3 12800 1600MHz Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® iMac Core I5 3.4 27-Inch (Late 2013) Me089Ll/A - A7 at Amazon.com