Model A1419 / Late 2012 / 2.9 & 3.2 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac13,2

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Replacing 1TB HDD with Samsung 840 Pro 256gb SSD. Temperature Sensor?


I am wanting to replace my 1TB Hdd in my 27" 2012 iMac. I have purchased the Samsung 840 Pro 256gb SSD but I read somewhere that you will need third party software to control the fan speeds once you remove the original HDD. Is this true?

I thought the 2012 iMac didn't require the temperature sensor on HDD because of it being built into HDD. Do SSD's need a temperature sensor? Do they have them built in?

Many thanks,


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Sadly SSD's don't offer an internal temp sensor that meets Apples spec. Here's a good writeup on what Apple did OWC - iMac HD Upgrading explained.

The correct way to deal with this issue (if your HD don't come with the needed sensor) or replacing the HD for a SSD is to get this kit: OWC Complete Hard Drive Upgrade Kit Including Tools for all 27" iMacs 2012 & Later.

A better solution is to leave the HD in and install the PCIe M.2 blade SSD the system is able to support (some are just now being made available by 3rd parties) or get a SSHD hybrid drive (Seagate) that has the needed internal sensor so you don't need to adapter kit.

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Ahh. So I will have to purchase this entire kit even though I just want the temp sensor?

I thought that I might not have needed the temp sensor with the Samsung 840 Pro for some reason.



OWC also sells the custom cable without the tools as well.


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HDD Fan control application is 38$ and solves the problem.

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asd, Focus on the unanswered questions and the ones that don't have an accepted answer as well. As to fan control app we've found fixing the system correctly is a much better solution as this app does not vary the fans as needed to cool the system so you end up killing your system.


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