Imac 2011 upgrade SSD but surprisingly Fan stay normal

[Spudy]

Hi all, I have just picked up an old Imac 2011 21.5 and replaced the original apple 3.5 HDD with an old Crucial M500 I had laying around ( completely removed the apple HDD and 3m tape the SSD to the back apple logo area until my bracket arrive), it was on High Sierra when i did the swap and Surprisingly I did not experience any "max'ed fan" issue, i didn't do any Y spliter hack nor keeping the original apple HDD, i initially thought I had faulty fan but when i install Mac Fan control, i was able to manually force the Fan to max rpm, and all the sensor reporting temperature according to Mac Fan control (the Crucial SSD reports a 30 ish Cecius temp also). I guess I shouldn't complain but i just want to find out the reason, is it possible that my store bought M500 from 2014 somehow had Mac compatible firmware already? Thanks

 

[theMarble]

is it possible that my store bought M500 from 2014 somehow had Mac compatible firmware already? Thanks

There is no such thing as a "mac compatible" SSD. What happened was the 2009-2011 iMac's had a special temperature sensor cable that was attached to hard drive, without it the SMC would crank the HDD fan up to max RPM.

Maybe some 2011 iMac's didn't need/use it.