If you haven't bought your system yet I would recommend you get one with the largest SSD Apple offers that you can afford and then if you want to add later a second SSD or HDD you'll have an easier time adding the SATA III (6.0 Gb/s) drive than trying to gain access to the custom PCIe/NVMe SSD blade drive slot on the back side of the logic board.
If you've already bought your system then I would recommend you forgo the internal blade SSD for now. Instead get an external Thunderbolt2 SSD RAID drive setup it will be cheaper and offer as good performance as the internal blade SSD. And lastly, be a lot less work and less risk as these systems are not easy to open!
Review this IFIXIT guide: iMac Intel 27" Retina 5K Display SSD Replacement. You'll need the special tools to open the system and Adhesive strips to put your system back together. The biggest risk is damaging the display in the process of removing it, that would be a very expensive Opps!
OK, you still want to go for it! What is the SSD I need. You'll need either a two or four lane PCIe/NVMe Apple custom SSD. I would strongly recommend getting the four lane but they are much harder to find. The part you found is a two lane model (mz jpus12t/0a6) while it will work you won't get the same performance as what Apple uses in this system a four lane SSD. So far no 3rd party offers blade SSD's for this series. They also only offer two lane versions as well for the older systems.
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Are you sure this is from the 2017 model Vs the 2015?
Here is a review from a trusted source: Mini-review: How much faster have high-end iMacs gotten in the last 5 years?, jump down to the section: SSDs: Getting the most from PCI Express
"The late 2015 iMacs gave their SSDs four lanes of PCI Express 2.0 bandwidth. The 2017 models bump this up to four lanes of PCI Express 3.0, roughly doubling the theoretical bandwidth. The actual drives aren't that much faster, but you still get improved performance with plenty of headroom for the future."
When I was checking the system out at the Apple Store I remember it being 4x PCIe 3.0 NVMe.
da Dan
That explains it! A fusion drive has a smaller 64 or 128 GB SSD. The straight high capacity SSD models have the four lane units.
da Dan
Of course, in this case it's 32GB.
So, if I buy an SSD from a macbook pro 2015 (x4 and 8GT / S) it will work without problems, right?
da ricardo
Sorry no, thats a PCIe 2.0 version you need a PCIe 3.0 version.
I haven't seen any available yet, which is why I was pushing you to buy the system with the SSD Vs later. If you can talk to Apple (Apple Store or who sold you the system) to see if you can swap it out. If you've just got the system you have a small window to do that.
da Dan
I forgot they lowered the SSD size to 32 GB on the newer systems as well. Here's more: iMac 1 TB Fusion Drives Have Smaller SSDs
da Dan
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