hard drive - How to control fan speed in macOS Sierra? - Ask Different
2008 iMac 20 Loud Fan SSD FAN Control app - YouTube
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 Adjust Mac Fan Speed Manually with Macs Fan Control | OSXDaily