iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
OWC 32GB (2 x 16GB) PC21300 DDR4 2666MHz SO-DIMMs Memory, Compatible with Mac Mini 2018, iMac 2019 and up, and Compatible PCs, (OWC2666DDR4S32P) at Amazon.com
27 inch iMac with Retina 5k Display 2019 3.7GHz i5 2TB Fusion Drive 16GB RAM | Refurbished | Techable
2013 Apple iMac 27" Core i5 3.4GHz MF886LL/A 32GB RAM 3TB HDD and 128SSD (Scratch and Dent Used) - Walmart.com
Apple iMac 21.5-inch and 27-inch (Late 2013) reviews | Macworld
iMac | 3.2 GHz Core i5 | 27 Inch | Late 2013 - Techable.com
iMac (27-inch, Late 2013) - Technical Specifications
2013 Apple iMac 27" Core i5 3.4GHz MF886LL/A 32GB RAM 3TB HDD and 128SSD (Scratch and Dent Used) - Walmart.com
Late 2013 iMac review: Faster than before, but the gains over previous models are modest | Macworld
A-Tech 16GB Kit (2x8GB) 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
iMac 27" 3.2GHz (Late 2013) | mac of all trades
Memory Upgrades for iMac 27-Inch (2012 - Mid 2015)
Install memory in an iMac - Apple Support
Amazon.com: 2013 Apple iMac with 3.2GHz Intel Core i5 (27-inch, 8GB 1TB Mac OS X) (Renewed) : Electronics
Apple iMac 27" A1419 SHELL 3.2GHz i5-4570 8GB RAM NO HDD NO SCREEN | eBay
How to upgrade the 27-inch 5K iMac (2019) with a massive 128GB of RAM [Video] - 9to5Mac
Can you upgrade the RAM in the 27-inch iMac? | iMore
How to Upgrade Memory in a 27-inch iMac (Late 2012-2013) iMac13,2 and iMac14,2 - YouTube