Skip to main content

Fix Your Stuff

Right to Repair

Store

Model A1419 / EMC 2806 / Late 2014 or Mid 2015. 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (iMac17,1) All with Retina 5K displays

394 Questions View all

I need Thermal Sensor when install ssd for iMac 27 5k 2015 Late?

Hey, guys

I wanna replace my HDD and install SSD for iMac 27 5k 2015 Late, but I don’t understand, do I need install a thermal sensor or not?

Update 10/25/17

But I still do not understand why? If on so 27” 5k 2015 the hard drive does not have a cable for a temperature sensor

Block Image

Answered! View the answer I have this problem too

Is this a good question?

Score 5

Comments:

To your update: Apple over the generations have used different methods of applying the sensor. The first gens had a stuck on sensor, the second which you have here in your image is leveraging the internal sensor the drive makers added. The newest generation uses a spare pin on the power cable connection to gain access to this built-in sensor and needs custom firmware.

Lets look at it this way: A Ford Thunderbird engine won't fit the newest Ford car would it? Yet they do the same thing! Over time things get improved as in this case.

But we still have a problem as the SATA SSD does not offer an internal sensor for the system to access directly. Which is why we need the OWC sensor cable to offer SMC services a means to see the needed sensor. Not to deal with high temps a HD would have but just to get the needed thermal input otherwise the system goes into Safe Mode! Fan going into high RPM. In addition the newer models the CPU also goes into Safe Mode as well lowering its clock cycle so the CPU doesn't overheat.

by

thanks for the detailed answer, now everything is clear

by

@iliabadgio - Don't forget the score the answer and accept it ;-}

by

Add a comment

2 Answers

Chosen Solution

Yes, you'll need a thermal sensor if you are swapping out your SATA HDD for a SATA SSD. Here is the part you'll need: OWC In-line Digital Thermal Sensor for Hard Drive Upgrade for 27" iMacs 2012 and Later. You'll also need an adapter frame: OWC 2.5" to 3.5" Drive Adapter Bracket. Here's the IFIXIT guide you'll need to follow: iMac Intel 27" Retina 5K Display Hard Drive Replacement

You do have a second option here which you might want to look at. If you currently don't have a PCIe NVMe blade SSD installed you could put one in which would give you still better performance! iMac Intel 27" Retina 5K Display SSD Replacement

If you do have a Fusion Drive config you'll need to break the fusion drive set before you remove the HDD. Also keep in mind the Fusion Drive blade SSD is quite small so you most likely will want to swap out to a larger drive.

iMac Intel 27" Retina 5K Display Hard Drive Image

Guide

iMac Intel 27" Retina 5K Display Hard Drive Replacement

Difficulty:

Moderate

1 - 2 hours

iMac Intel 27" Retina 5K Display Blade SSD Image

Guide

iMac Intel 27" Retina 5K Display Blade SSD Replacement

Difficulty:

Difficult

2 hours

Was this answer helpful?

Score 3

Comments:

thnk you for answer

by

Because that is how Apple designed that specific model.

by

Add a comment
Most Helpful Answer

I have fitted a 1TB WD blue ssd to my late 2015 imac 27”, it had no hard drive before, just the PCIe SSD. All I needed to source was the Sata/power cable.

I did NOT fit any thermal sensor and it works perfectly, no fan spin or any other problems. I also replaced the PCIe SSD with a Samsung NVMe 1TB unit with an adapter, this also works perfectly.

I conclude that at least on late 2015 model. NO thermal sensor is required. The system reads the drive temperatures fine so they must now use the Smart data.

Its been working for 3 months now like this, don’t waste your hard earned money on un-neccesary stuff.

Was this answer helpful?

Score 7

Comments:

So you have 2 x 1TB SSD in your iMac. Are you using them separately or in a FusionDrive setup? How is it with the Samsung NVMe 1TB, must be insanely fast. What kind of adapter did you use?

Is everything still running with no fan issues?

by

Still running perfectly, 2 seperate drives NO fusion drive.

by

Apple altered their thermal sensor needs, dropping the requirement for the needed sensor using SMART instead. You need to be running Sierra or newer as the firmware needs an update.

by

I like to replace the hard disk with SSD in an iMac 27 inch late 2013. You are saying the new OS doesn't need hardware temperature sensor any more because the newer Mac OS now uses SMART?

by

I have the same question

by

Show 1 more comment

Add a comment

Add your answer

Ilia Bagaev will be eternally grateful.
View Statistics:

Past 24 Hours: 17

Past 7 Days: 114

Past 30 Days: 587

All Time: 15,881