If you are upgrading the main bay in any imac late 2009 current besides the 21 5 2013 2013 imac you will need the owc thermal sensor cable.
Imac 2015 ssd thermal sensor.
I did not fit any thermal sensor and it works perfectly no fan spin or any other problems.
I have fitted a 1tb wd blue ssd to my late 2015 imac 27 it had no hard drive before just the pcie ssd.
I would have had to use the sensor anyway as the new drive is mechanical but if you ve purchased an ssd prior to 2015 that you wish to swap in use the temp sensor.
I think that owc thermal cable for imac 2013 and later is a scam.
This hack fix bypasses the hdd temperature sensor in order to fool imac into thinking that hard drive is working at normal temperature.
Imac hard disk removal imac ssd upgrade thermal sensor link posted under description imac 27 harjindersidhu sidhudiy easysteps use screwdriver t8x50.
Also this version of the 27 imac imac14 2 doesn t have the emmc slot on the logic board so i couldn t get say a 64gb emmc drive to do the fusion drive upgrade.
I would use this as a workaround and stil.
All i needed to source was the sata power cable.
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If you are installing an ssd to replace the hdd on imac 2013 and later you don t even need the thermal sensor cable from owc because the heat info will be read through s m a r t.
I also replaced the pcie ssd with a samsung nvme 1tb unit with an adapter this also works perfectly.