iMac 2013 (and later) with NVME SSD?

Discussion in 'iMac' started by mbosse, Jul 18, 2018.

  1. mbosse macrumors 6502

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    #1
  2. ssdaytona macrumors regular

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    #2
    I will be attempting this on a 2015 imac 27” later in the week. I am just waiting for m2 to Apple 16+12 pin adapter

    Note: pre-2015 iMac have pcie 2.0x2 where as the late 2015 iMac have pcie 3.0x4
     
  3. mbosse thread starter macrumors 6502

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    GREAT - please let me know how it worked out. The different PCIe types just have an impact on the maximum speed, right?
     
  4. ssdaytona macrumors regular

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    #4

    just completed the install. it works great! here are some pics.
     

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  5. mbosse, Jul 26, 2018
    Last edited: Jul 26, 2018

    mbosse thread starter macrumors 6502

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    WOW - which adapter do you use? Do you use the 970 Pro as boot drive? Any issues with fan control, powering up, or sleep and wake from there? Does TRIM work? Cheers, Magnus
     
  6. Sackofnickels Suspended

    Sackofnickels

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    Have not tried it on an iMac, but it seems to come down to finding the right combination. Some adapters and SSD's work better than others. Put a EVO 960 pro into a 2014 Mini. Works great, but it took two different adapters before I found one that worked. The same combo did not work well in a 2014 MBA. Would not wake from sleep properly and battery life suffered.
     
  7. mbosse thread starter macrumors 6502

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    #7
    Thanks for sharing your experience, which one worked?
     
  8. Sackofnickels Suspended

    Sackofnickels

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  9. ssdaytona macrumors regular

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    so, the drive is very fast and the install wasn't as difficult as I had expected. NOTE: you do not need to take out the entire right speaker. Just loosen it to unplug the cables.

    I do have a problem with sleep. This is the first adapter (sintech ST-NGFF2013) that I purchased and I'm still trying to sort things out.
     
  10. mbosse thread starter macrumors 6502

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    Thanks again. Please keep us posted. I have a 2 TB Samsung reserved for me already...
    --- Post Merged, Jul 26, 2018 ---
    Did you get the ST-NGFF2013-C or the ST-NGFF2013?
     
  11. ssdaytona, Jul 26, 2018
    Last edited: Jul 26, 2018

    ssdaytona macrumors regular

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    i purchased the standard ST-NGFF2013. if I can just disable sleep then I would be very happy.

    [UPDATE]

    I just tried the ST-NGFF2013-C adapter and I still have sleep issues. I suspect it's the 970 Pro ssd. that's too bad. Now, I just need to figure out how to disable sleep completely.
     
  12. ssdaytona macrumors regular

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    well, I just used the following command and it disables deepsleep and just suspends to disk. I suspect the ssd is unable to wake from deepsleep. all is well.

    sudo pmset -a hibernatemode 25 standby 0 autopoweroff 0


    anyone need a sintech adaptor? I have an extra one
     
  13. mbosse thread starter macrumors 6502

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    #13
    Thanks for this. Did you measure the heat the Samsung produces? Can you enable TRIM? Thanks, Magnus
     
  14. ssdaytona macrumors regular

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    #14
    TRIM is automatically enabled. No temp measurements
     
  15. Earl Urley macrumors 6502

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    With 2012-2013 iMacs it's probably less practical as those use SATA-based SSDs.

    I believe the 21.5-inch 2015s got the short end of the stick as they only have PCIe 2.0 x2 connectors.

    Haven't had a chance to look but I bet the 2015 27-inch iMac BootROM doesn't include the NVMe DXE driver you need to stabilize sleep / hibernate functions.
     
  16. mbosse thread starter macrumors 6502

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    2013 used PCIe already.
     
  17. ssdaytona macrumors regular

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    hibernation where it writes to disk and powers everything off (hibernatemode 25) works just fine. normal sleep where everything enters a low power state (standard for desktops) does not work. You may be right about the bootrom. How do we find out?

    I'm quite happy with it. I just disabled std sleep and everything works great. Restart, shutdown, cold reboot, all work great. It's one of the faster SSDs. I wonder if it's an issue with Samsung nvme drives.


     
  18. mbosse thread starter macrumors 6502

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    #18
    You did not use any Kapton tape, correct? You simply installed the SSD in the adapter, and then it worked? Still happy with it?

    Today I got my Samsung 970 Evo, the adapter is still in the mail...

    Cheers,
    Magnus
     
  19. ssdaytona macrumors regular

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    No tape. I just used it bare. Works well and fast. No kernel panics during normal use. I just don’t have any sleep capability.
     
  20. mbosse thread starter macrumors 6502

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    Ok, I converted my Late 2013 27" iMac now with a 2 TB Samsung 970 Evo using the Sintech ST-NGFF2013-C adapter. As you said, it is straight forward and without any hassles (except that you have to open the iMac). TRIM is automatically enabled:

    Untitled 2.jpg

    I am getting speed rates of slightly below 780 MB/s (both read and write), which is way under the Samsung's nominal performance:

    DiskSpeedTest.jpg

    The above speed test was performed directly after installation, so it might be the drive's thermal throttling in action. The iMac however feels blistering fast and the installation was extremely quick as well. What speeds could I expect with the Late 2013 iMac (PCIe 2.0x2)?

    Furthermore, SMART data readings is not supported:

    Untitled.jpg

    As it stands I am not sure whether I keep the setup or whether I switch and install a standard SATA SSD. I am travelling right now so further testings will have to wait.

    Thanks,
    Magnus
     
  21. ssdaytona, Aug 18, 2018
    Last edited: Aug 18, 2018

    ssdaytona macrumors regular

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    I think that's as fast as you'll get with the 2013 iMac


    PCIE link speeds...

    "A single PCIe 1.0 (or 1.1) lane can carry up to 2.5 Gigatransfers per second (GT/s) in each direction simultaneously. For PCIe 2.0, that increases to 5GT/s, and a single PCIe 3.0 lane can carry 8GT/s."
     
  22. mbosse thread starter macrumors 6502

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    #22
    Is it normal that SMART data are not supported? Magnus
     
  23. ssdaytona macrumors regular

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    #23
    same with mine. SMART status is not supported
     
  24. macguru8 macrumors newbie

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    Hello ssdaytona. I have a iMac (Retina 5K, 27-inch, Late 2015), I would like to install the Samsung M.2 in your test. Which adapter do you recommend, the standard ST-NGFF2013 OR THE ST-NGFF2013-C? Thanks in advance.
     
  25. ssdaytona macrumors regular

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