How to Add An SSD To The 27" iMac (Late 2015) - iFixit Repair Guide
Download free SSD Fan Control for macOS
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 Upgrade Your iMac with an SSD (2021 updated) | Upgradeable Australia