iMac Intel 21.5" EMC 2389 Hard Drive Fan Replacement - iFixit Repair Guide
OWC In-Line Digital Thermal Sensor HDD Upgrade Cable for iMac 2011
iMac Intel 21.5" and 27" (Mid 2011) SSD Temperature Sensor - iFixit Store
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
iMac Optical Drive Fan Replacement - YouTube
mid-2011 iMac clicking sound - Apple Community
hard drive - iMac 27" Mid 2011 -- fan issues when removing internal HDD? - Ask Different
hard drive - Is lowering my ODD fan speed dangerous after installing and SSD? - Ask Different
Buy OWC in-Line Digital Thermal Sensor HDD Upgrade Cable for iMac 2011, (OWCDIDIMACHDD11) Online in Vietnam. B00J42AFUA
Further Explained: Apple's iMac 2011 Model Hard Drive 'Restrictions'
2011 27" iMac SSD upgrade + fan speed - Whats the current consensus? | MacRumors Forums
2010 iMac 27" - replace optical drive with slot fan to quietly lower temps? | tonymacx86.com