SSD Upgrade on 2015 iMac 5K

262Runnr

macrumors regular
Original poster
Jul 21, 2008
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I'm wondering what kind of performance increase I would expect upgrading my 2TB Fusion drive with a 2TB SSD?
I've got 32GB of DDR3 RAM.
Thanks.
 

TwoH

macrumors regular
May 19, 2019
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You'd see a great increase in speed, and reliability using only an SSD instead of a fusion between an SSD and HDD.
It is worth it.
 

262Runnr

macrumors regular
Original poster
Jul 21, 2008
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Thanks, I'll probably do the upgrade in the Spring and see if prices drop further. My computer is working fine now....However, there is some question as to whether I will need the digital thermal sensor cable??


My iMac is late 2015 so I don't believe that I will need it....
 

TwoH

macrumors regular
May 19, 2019
183
65
With a 2.5" SSD - I have found you don't need an OWC temperature sensor for it - I've only had fans ramp on 2015 iMacs with HDDs that were not Apple HDD.
If you're using a flash SSD, you do not need a temperature sensor either, you would simply need to remove the SATA cable if you are removing the HDD as that would cause the fans to ramp.
 

262Runnr

macrumors regular
Original poster
Jul 21, 2008
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The only other issues that I have before making the swap is the fact that I don't think I'll be able to do a restore from my Time Machine backups...I believe that since the Fusion is actually two separate drives that the machine will need a fresh installation of MAC OS and won't be able to restore from back-up....am I correct?
Thanks.
 

TwoH

macrumors regular
May 19, 2019
183
65
I don't see why the fusion should make it an issue? It should be okay to restore from Time Machine I'd assume.
 

TwoH

macrumors regular
May 19, 2019
183
65
I'll have a look at it later and see how I can help if no one else responds.
 

262Runnr

macrumors regular
Original poster
Jul 21, 2008
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OK, just to get an official definite answer I called Apple Support which has always worked great for me.

There is no issue in restoring a Time Machine Backup to the new SSD drive coming from my Fusion Drive....However, the Time Machine Backups will not longer work correctly to restore backups on the new SSD once the OS is restored.
You need to make new Time Machine backups from the SSD drive for it to work correctly which is not a problem.
Once I've migrated my backup to the new SSD from Time Machine, I'm going to wipe the Time Machine drive and use it for the new SSD installation.
Hope this helps someone also looking to do this.
 
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262Runnr

macrumors regular
Original poster
Jul 21, 2008
224
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Done!....that was easy...:)
the hardest part, other than using a couple guitar picks to open it up (and it wasn't too hard really) was figuring out how those damn display cables are connected to the motherboard....
I didn't want to break anything and couldn't figure out exactly how they disconnected...took almost as long to do that as it did to peel open the case.
I already created a new backup from the SSD image in Time Machine....Piece of cake! :)

Screen Shot 2020-01-18 at 9.01.23 PM.png
 
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