SanDisc X300 (256gb) - fan control problem iMac (late 2009)

Hello. I have upgraded my old Imac 21 with SSD x300 256gb (

Everything is ok SSD is recognised by imac,  but there is a problem occured - the hard drive fan is always on max 6000rpm while loading a system at startup. Only some soft help to put it in manual mode but only when system is loaded.

Is there any upgrades for Imac (El Capitain OS)?

thank everyone for any replys

Best regards 


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