How to Upgrade iMac Hard Drive or SSD 2012-2022: EveryMac.com
2011 imac 27" 32GB - final stage of 1TB + 2TB SSD upgrade (replaced HDD & optic drive). Also cleaned out the fans and case. Running 'SSD Fan Control' & 'Macs Fan
How to Add An SSD To The 27" iMac (Late 2015) - iFixit Repair Guide