Model A1418 / Late 2013 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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additional ssd in the a1418 late 2013?

I would like to know if possible to have the original hdd and an additional SSD (as primary) installed in the imac 21.5 late 2013 (14,1), model A1418?

and if yes, what kind of mounting bracket and cales requred?

thank you

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Sadly, you are between a rock and a hard place.

First the newer 'Thin Series' iMacs are a bear to open.

Second, if you didn't get a system with a SSD, adding one requires taking just about everything out as the Apple custom blade SSD slot Is on the back side of the logic board.

Here's the IFIXIT guide to do it if you are up to it: iMac Intel 21.5" EMC 2638 SSD Replacement. Make sure you have the correct tools as many people have damaged the display unit just in the process of taking it off. You will also need a set of adhesive strips to put it back. Also make sure you follow proper ESD precautions as well!

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Here's a good source for the custom Apple SSD's: BeetsTech - The Ultimate Guide to Apple’s Proprietary SSDs

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I need to know if I can install a SSD like this one: Samsung 970 EVO 500GB NVMe/PCIe M.2 SSD

With an adapter like this one: PCI-E x4 M.2 NGFF to SSD Adapter for MacBook Air A1465 A1466 A1398 A1502. Or must I install an Apple OEM SSD?

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Apple uses a custom blade SSD which is not the same as the M.2 standard

While some people have made adapters to support the M.2 SSD within some Mac's, they have not been tested that well. We did some tests early on with the first generation of these adapters and found they just weren't that good we encountered lots of CRC errors. Which while not visible to the user without good diagnostic tools, the extra re-transmissions slow the data transfer and can over time wear out the SSD with multiple mis-writes. We did our testing on MacBook Pro retina and MacBook Air systems. I don't know of anyone doing any testing with the PCIe/AHCI (x2) SSD's or newer PCIe/NVMe SSD's (x2 or x4) in any iMac.

I would also point out the iMac's are not easy the open than the older models as you need to carefully remove the display assembly with is glued in. Many people have damaged their displays just in the process of opening the system as they did not use the correct tools or techniques as outlined in the IFIXIT guides. If is very easy to damage the display who would be an expensive mistake!

So you are taking a risk here venturing into uncharted space using this adapter and M.2 SSD. I would strongly recommend you talk to the adapter company to see if they support the iMac and what SSD's they have tested if you are going forward here with the adapter.

Otherwise, I think its just smarter to go with the correct part which has become easier to get. Your system came with a PCIe/AHCI 2 lane SSD. BeetsTech reported some Generation 3 SSD systems are able to support the newer PCIe/NVMe drive. But again I have not tried to do that. I have put in a quite a few Samsung custom Apple SSD's as upgrades with great success (staying with what Apple used per the system I was working on), as such I would strongly recommend sticking with the custom drives.

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