Super loud ssd fan speed on iMac Late 2009

I have an iMac 27" Late 2009 (quad core i7, ATI Radeon HD 4850 512 MB) and 2 years ago i have swapped the 2TB HDD to an 1TB Patriot Burst SSD. After that upgrade the fans started running like crazy. I did my research and i found out that most people who upgraded to ssd on these old machines had the same problems, but i didn't actually tried to fix it because it didn't bother me so much and i didnt want to download 3rd party apps because i wasnt sure with myself. But the last few months the problem become really annoying because i started using the computer more. I downloaded an app "Macs Fan Control" and i saw that the ssd fan ran at 4000 RPM (almost 5 minutes after i have turn on the computer) while the other 3 fans were at 1000 RPM. The ssd temperature is on 30ºC.


So, I want to know if the settings i applied are ok (like if the temp should be around the values i entered), even if the software i chose is ok and if the ssd temp i see is true (because i know that its possible that some ssd's dont have temperature sensors)


this is also the link of my ssd: https://www.amazon.com/Patriot-PBU960GS25SSDR-Memory-Burst-Internal/dp/B07GYRRQSN?th=1


iMac 27″, macOS 10.13

Posted on May 8, 2022 5:19 AM

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Posted on May 8, 2022 5:51 AM

An in-line temp. sensor should have been used when upgrading the HDD to an SSD. If you go to the OWC or iFixit DIYs you will notice that they sell upgrade kits that include the in-line temp. sensor.


That water under the bridge now.


Yes MacFanControl is a good utility. Personally I would choose the GPU for the Sensor-Based Control, then set more distance between the lower and upper settings. Something more like 40 for the lower and 85 or so for the upper. That way the fan will not ramp up so fast.


Another option, is to use the fixed fan speed of 2000rpm for the HDD and let other fans run at the default or sensor-based settings.

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Question marked as Top-ranking reply

May 8, 2022 5:51 AM in response to AndreasKaram

An in-line temp. sensor should have been used when upgrading the HDD to an SSD. If you go to the OWC or iFixit DIYs you will notice that they sell upgrade kits that include the in-line temp. sensor.


That water under the bridge now.


Yes MacFanControl is a good utility. Personally I would choose the GPU for the Sensor-Based Control, then set more distance between the lower and upper settings. Something more like 40 for the lower and 85 or so for the upper. That way the fan will not ramp up so fast.


Another option, is to use the fixed fan speed of 2000rpm for the HDD and let other fans run at the default or sensor-based settings.

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Super loud ssd fan speed on iMac Late 2009

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