Upgrading an 2017 iMac 27" with an off the shelf NMVe m.2 SSD + M.2 Apple PCIe adapter is definitely possible.
I am amazed how much confusion information is on the internet about this topic. Even from OWC, which only wants to sell a SATA upgrade kit for the 2017 iMac.
So I thought, try and find it out.
I did my 2017 iMac with a EVO 970 NVMe SSD + Sintech M.2 NVMe to Apple PCEe adapter.
I only recommend the Sintech adapters, others are known to have issues.
I have some images on instagram where I did my upgrade.:
I am happy I did it and got rid of the FusionDrive setup.
As a note, if you plan to replace the SATA drive with an SSD, which I also did then "No" you do not need the overpriced and useless thermal Sensor from OWC either.
I recommend the regular EVO not the EVO Plus or EVO Pro.
If you still insist on using the non standard EVO then Samsung released an firmware update for the EVO Plus that fixes issues on Mac, you need to upgrade it first using a PC before putting the drive in your Mac.
Can we leave the Fusion drive in after we install the NVMe?
A Fusion Drive is physically two drives made up of the SATA drive and the PCIe Blade Drive, so you'er not adding a drive here you’re trading one drive for another.
If you need performance I don't recommend Fusion Drives, I recommend dual dedicated drives. The Blade SSD being the Boot drive with the app's and the rest of the drive left bare for V-RAM, Apps Caching and Paging. I would also set the drive as the scatch drive is the app allows it and you may need a larger drive if you do. Then use your HDD as the date drive holding your stuff.
Yes, you can create a Fusion Drive from your new NVMe SSD and the SATA drive of your iMac. If you want a really faster upgrade then replace the 3.5˝ HDD SATA with a "big" 2.5˝ SSD as they are a lot cheaper now.
door Alex Rettig
Creating a Fusion Drive with anything larger than 128 Gb drive is a waste!
I already bought 512 GB Samsung Pro 960 M.2 SSD. After I disassembled my iMac 2017 27". I'm shock realizing the interface is different! I feel stupid.
I'm ordering the adapter which is about 1 month to arrive. =( I'll buy the adapter to SATA for now and use it as storage. Later on I'll buy the correct SSD and install the OS on it.
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