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Model A1224 / Early 2009 / 2.66 GHz Core 2 Duo processor

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High hard drive fan speed after SSD upgrade

I just upgraded the drive on my 2009 iMac to a 500GB SSD using the iFixit kit. Everything is good but the hard drive fan now runs at full speed all the time which I gather is a common problem after SSD upgrades. I am temporarily managing it by overriding system fan control using TG Pro to keep the fan speed down but doesn’t seem like a good, long-term solution.

I re-used the adhesive temp sensor from the old drive (now sticking to the metal case of the new SSD) and TG Pro reads ~40°C (@ 1600RPM). So, if the sensor is reporting that the drive is at a reasonable temp, why does the computer think it needs to run the fan so fast?

Is there a solution to this that lets the computer properly regulate fan speed without being overridden or is there some hardware flaw I need to address?


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OWC In-line Digital Thermal Sensor for iMac Late 2009 - Mid 2010 Hard Drive Upgrade

  1. Required for any drive installed into the main drive bay.
  2. Eliminate fan noise and maintain correct system fan control when upgrading your late 2009 - mid 2010 iMac.
  3. The only iMac HDD upgrade option on the market certified to pass the Apple Hardware Test.
  4. Fixes firmware incompatibility issues with third party hard drives.

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Thanks, I'll check out the OWC cable.


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