Model A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 or 3.8 GHz Core i5 or 4.2 GHz Core i7 Kaby Lake Processor / Retina 5K display

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NVME M.2 SSD with adapter

Is it possible to update 2017 iMac 27" 5k with NMVe m.2 SSD using m.2 to Apple PCIe adapter?

I used to use SM951 AHCI in Mac Pro 5.1, 6.1, all Retina and Air 2013-2015 but what about NVMe once? Have anyone tried?

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First you may want to look at this Vid: 2017 27-inch iMac with Retina 5K Display Unboxing and Teardown jump to the 10:00 time point which shows the PCIe SSD Apple is using. It's very different from the M.2 SSD's.

Apple's PCIe NVMe SSD's use a custom device driver so while you might be able to get the adapter and NVMe SSD to physically fit it won't be recognized by the OS.

While I haven't tried anything in this new iMac I can tell you I've tried the newer MacBook Pro retina series which has a 2 lane NVMe SSD and it didn't work.

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Which MacBook you tried? AHCI m.2 SSDs with adapter works fine with all late 2013-2015 MacBooks Pro/Air. Confirmed many times.

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Don't get confused here! AHCI is not the same as NVMe! What worked in the older systems does not work in the newer systems.

Review this: SATA Express (SATAe) Your older system uses the Red path with the AHCI (SATA) the newer systems use the Yellow path with Apples PCIe (NVMe) drive.

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