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 iMac 2019 from fusion HDD to SSD (4k) - YouTube
How to Upgrade iMac Hard Drive or SSD 2012-2022: EveryMac.com