A list of successful iMac 27" (2012-2019) SSD upgrades

Discussion in 'iMac' started by dobrink, Dec 27, 2018.

  1. dobrink, Dec 27, 2018
    Last edited: Jun 11, 2019

    dobrink macrumors member

    dobrink

    Joined:
    Feb 4, 2013
    Location:
    Helsinki, Finland
    #1
    Here you can find and discuss all the collected knowledge regarding upgrading the HDD, blade SSD and CPU of a 27" iMac 2012-2019, as well as a list of performed upgrades.

    Here is a list of all 27" iMac models subjected in this thread:

    Late 2012 - 13.2 - MD095LL/A (2.9Ghz i5-3470S, HDD only / Fusion HDD+128GB blade / blade only)
    Late 2012 - 13.2 - MD096LL/A (3.2Ghz i5-3470, HDD only / Fusion HDD+128GB blade / blade only)
    Late 2012 - 13.2 - none (3.4Ghz i7-3770, HDD only / Fusion HDD+128GB blade / blade only)
    Late 2013 - 14.2 - ME088LL/A (3.2Ghz i5-4570, HDD only / Fusion HDD+128GB blade / blade only)
    Late 2013 - 14.2 - ME089LL/A (3.4Ghz i5-4670, HDD only / Fusion HDD+128GB blade / blade only)
    Late 2013 - 14.2 - MF125LL/A (3.5Ghz i7-4771, HDD only / Fusion HDD+128GB blade / blade only)
    Late 2014 - 15.1 - MF886LL/A (3.5Ghz i5-4690, Fusion HDD+128GB blade / blade only)
    Late 2014 - 15.1 - none (4.0Ghz i7-4790K, Fusion HDD+128GB blade / blade only)
    Mid 2015 - 15.1 - MF885LL/A (3.3Ghz i5-4590, HDD only / Fusion HDD+128GB blade / blade only)
    Late 2015 - 17.1 - MK462LL/A (3.2Ghz i5-6500, HDD only / Fusion HDD+128GB blade / blade only)
    Late 2015 - 17.1 - MK472LL/A (3.2Ghz i5-6500, Fusion HDD+24GB blade / HDD+128GB blade / blade only)
    Late 2015 - 17.1 - MK482LL/A (3.3Ghz i5-6600, Fusion HDD+128GB blade / blade only)
    Late 2015 - 17.1 - none (4.0Ghz i7-6700K, Fusion HDD+24GB blade / Fusion HDD+128GB blade / blade only)
    Mid 2017 - 18.3 - MNE92LL/A (3.4Ghz i5-7500, Fusion HDD+32GB blade / Fusion HDD+128GB blade / blade only)
    Mid 2017 - 18.3 - MNEA2LL/A (3.5Ghz i5-7600, Fusion HDD+32GB blade / Fusion HDD+128GB blade / blade only)
    Mid 2017 - 18.3 - MNED2LL/A (3.8Ghz i5-7600K, Fusion HDD+128GB blade / blade only)
    Mid 2017 - 18.3 - none (4.2Ghz i5-7700K, Fusion HDD+32GB blade / Fusion HDD+128GB blade / blade only)
    Early 2019 - 19.1 - MRR12LL/A (3.0Ghz i5-8500, Fusion HDD+32GB blade / Fusion HDD+128GB blade / blade only)
    Early 2019 - 19.1 - MRR02LL/A (3.1Ghz i5-8600, Fusion HDD+32GB blade / Fusion HDD+128GB blade / blade only)
    Early 2019 - 19.1 - MRQY2LL/A (3.7Ghz i5-9600K, Fusion HDD+128GB blade / blade only)
    Early 2019 - 19.1 - none (3.6Ghz i9-9900K, Fusion HDD+32GB blade / Fusion HDD+128GB blade / blade only)



    The iMacs before 2017 have issues with the drive's power states after upgrading the blade SSD with a non-Apple NVMe. The iMacs above marked in BLUE will crash when waking from hibernation, self restart with two start-up chimes. The iMac models marked in ORANGE will either "restart because of a problem", or show a folder with question mark icon (depending on the system event produced).

    Until Apple patches the bootrom with the full NVMe driver that 2017 and 2019 iMac models have, the only way to prevent your iMac from crashing is type the following command in Terminal:

    For Late 2015 iMacs (disabling normal sleep) -> sudo pmset -a hibernatemode 25 standby 0
    For Late 2012 until Mid 2015 iMacs (disabling hibernation) -> sudo pmset -a hibernatemode 0 standby 0 autopoweroff 0
    (for the models in blue, alternatively, instead of standby 0, you can leave the standby at 1, and use for example standbydelayhigh 2592000 which equals to one month in seconds)



    Regarding the HDD upgrade, almost all (if not all) of the reports for upgrades on 27" iMacs Late 2012 and newer, the OWC's temperature sensor is NOT needed! On older models there would be the fan-spinning-on-max-rpm issue. Perhaps, the newest OS X firmware has eliminated the issue so the temperature control no longer triggers the fan to spin at max rpm in the slim iMac models.


    The tools you are going to need are color coded as follows: all, HDD, Blade, CPU.

    -T8, T10 Torx screwdrivers
    -wheel opening tool (€1)
    -plastic card opening tool (€1) (optional)
    -1-2x suction cups (€2)
    -spudger tools (€1)
    -tweezers (€1) (optional)
    -adhesive strips (€2)


    -mounting bracket (€2)
    -2.5" SATA SSD (example Samsung 860 Evo)
    -OWC thermal sensor (€40) (most likely NOT required!)


    -adapter for the blade drive (8-13€)
    -a small screw to hold the new blade drive on place (it is missing on HDD-only models)
    -T5, T25 Torx s
    crewdrivers
    -thermal paste for the CPU and GPU (€7)
    -a compatiable intel CPU from the same generation as the original


    For the blade SSD upgrade it does not matter which of the three adapters you use (first, second, third), or if it is sold on ebay, amazon, or wherever else, or if it is branded as Sintech or Kalea or whatever else, they are all the same. Using an AHCI blade will never give you hibernation issues, though those are very limited and no longer manufactured. It does not mater which NVMe drive you use, except the 01.2019 released Samsung 970 Evo Plus which is not compatible with any of the adapters, so do NOT use it unless a new adapter is released.

    IFixit guide for SATA HDD replacement
    IFixit guide for Blade SSD replacement
    IFixit guide for CPU replacement
    IFixit guide for Adhesive strips application


    Examples of how to report your upgrade. These two upgrades below I personally did in 02.2019:

    1) HDD + CPU upgrade

    Device: Late 2013 - 14.2 - ME088LL/A (3.2Ghz i5-4570, HDD only)
    HDD upgrade: 1 TB SATA HDD -> 1TB Samsung 860 Evo SATA SSD
    CPU upgrade: i5-4570 -> i5-4670K
    Speed test: around 500 MB/s read, 500 MB/s write
    OS: Mojave 10.14.3
    Location: Finland, Europe
    Temperature sensor: none
    Issues after fresh OS install: everything is ok with the fan, OWC temperature sensor NOT required!
    More details and problems >here<


    2) Blade + CPU upgrade

    Device: Late 2015 - 17.1 - MK462LL/A (3.2Ghz i5-6500, HDD only)
    Blade upgrade: none -> 1TB ADATA XPG SX8200 Pro
    CPU upgrade: i5-6500 -> i7-6700K
    Speed test: 3000 MB/s read, 2300 MB/s write
    OS: Mojave 10.14.3
    Location: Finland, Europe
    Adapter: Sintech ST-NGFF2013
    Issues after fresh OS install: the iMac cannot wake from normal sleep, have to use hibernate 25 instead and disable standby.
    More details and problems >here<


    The following is a list of upgrades performed by other people, I will update the list as new entries become available:

    Blade drive upgrade by Jeden87

    Device: Late 2015 - 17.1 - MK472LL/A (3.2Ghz i5-6500, Fusion HDD+24GB blade)
    Blade upgrade: 24GB Blade -> 512GB Samsung 970 Pro NVMe SSD
    Speed test: 2900 MB/s read, 2200 MB/s write
    Adapter: Sintech ST-NGFF2013
    Issues after fresh OS install: the blade drive does not wake up from sleep, have to restart, or disable sleep entirely


    Blade drive upgrade by MKhan

    Device: Late 2013
    Blade upgrade: ?? blade -> 512GB Samsung 970 Pro NVMe SSD
    Speed test: 756 MB/s read, 756 MB/s write
    Adapter: KALEA-INFORMATIQUE
    Issues after fresh OS install: the blade drive does not wake up from sleep, have to restart, or disable sleep entirely


    Blade upgrade by ssdaytona

    Device: Late 2015 - 17.1 - MK472LL/A (3.2Ghz i5-6500, Fusion HDD+24GB blade)
    Blade upgrade: 24GB Blade -> 512GB Samsung 970 Pro NVMe SSD
    CPU upgrade: i5-6500 -> i7-6700K
    Speed test: 2930 MB/s read, 2170 MB/s write
    Adapter: Sintech ST-NGFF2013 and ST-NGFF2013-C
    Issues after fresh OS install: sleep issues with both adapters, have to disable sleep


    Blade + HDD upgrade by jdee2wheels

    Device: Mid 2017 - 18.3 - MNE92LL/A (3.4Ghz i5-7500, Fusion HDD+32GB blade)
    Blade upgrade: 32GB Blade -> 1TB Samsung 970 Evo NVMe SSD
    HDD upgrade: 1TB SATA HDD -> SanDisk 2TB 3D SATA III
    Speed test: blade 2500 MB/s write, 2900 MB/s read, SATA SSD 450-ish
    OS: Mojave 10.14.2
    Adapter: Sintech NGFF M.2 nVME SSD Adapter Card, OWC temperature sensor for SATA SSD
    Issues after fresh OS install: NONE


    HDD upgrade by uller6

    Device: Late 2014 - 15.1 - none (4.0Ghz i7-4790K, Fusion HDD+128GB blade)
    HDD upgrade: 1TB SATA HDD -> Crucial M500 2TB SSD
    Speed test: 500 MB/s read, 480 MB/s write
    OS: Mojave 10.14.2

    Temperature sensor: none
    Issues after fresh OS install: NONE - everything works perfectly


    Blade + CPU upgrade by mbosse

    Device: Late 2013 - 14.2 - MF125LL/A (3.5Ghz i7-4771, Fusion HDD+128GB blade)
    Blade upgrade: 128GB blade -> 2TB Samsung 970 Evo NVMe SSD
    Speed test: 780 MB/s read, 730 MB/s write
    OS: High Sierra 10.13.6
    Location: Austria, Europe
    Adapter: Sintech ST-NGFF2013
    Issues after fresh OS install: the blade drive does not wake up from sleep


    Blade + HDD + CPU upgrade by macguru8

    Device: Late 2015 - 17.1 - MK462LL/A (3.2Ghz i5-6500, HDD only)
    Blade upgrade: none -> 500GB Samsung 970 EVO 500GB M.2 NVMe SSD
    HDD upgrade: 1TB SATA HDD -> Seagate Barracuda Pro ST4000DM006 4TB 7200 RPM 128MB Cache
    CPU upgrade: i5-6500 -> i7-6700K 4.00 GHz Unlocked Quad Core Skylake
    Speed test: 3070 MB/s read, 2374 MB/s write
    OS: Mojave 10.14.3
    Adapter: Sintech ST-NGFF2013-C
    Temperature sensor: required for the HDD

    Issues after fresh OS install: the iMac cannot wake from normal sleep unless I press the power button, had to use hibernate 25 instead and disable standby


    Blade +HDD upgrade by MBehr2

    Device: Late 2015 - 17.1 - MK472LL/A (4.0 Ghz i7-6700K, blade only 512GB)
    Blade upgrade: 512GB blade PCIe SATA -> 1TB WDS100T3X0C-00SJG0 (102000WD) PCIe NVMe (WD BLACK SN750 NVMe SSD) + a heat sink.
    HDD upgrade: none -> 1TB WDC WDS100T2B0A-00SM50 (X61190WD)
    Speed test: 2723 MB/s read, 2913 MB/s write
    Adapter: Sintech ST-NGFF2013

    Location: Canada, North America
    Temperature sensor: works fine without, thus not required
    Issues after fresh OS install:
    sleep issues, have to disable sleep


    Blade +HDD upgrade by rxs0

    Device: Mid 2017 - 18.3 - MNE92LL/A (3.6Ghz i7-7700, Fusion HDD+32GB blade)
    Blade upgrade: 32GB Blade -> 2TB Samsung 970 EVO NVMe SSD
    HDD upgrade: 1TB SATA HDD -> 1TB Samsung 960 EVO SATA SSD
    Speed test: blade 2500 MB/s write, 3000 MB/s read, SATA SSD 450-ish
    OS: Mojave 10.14.4
    Adapter: Sintech ST-NGFF2013-C with additional Kapton tape
    Temperature sensor: not used
    Issues after fresh OS install and restore:
    NONE, no sleep or hibernate issues


    Blade upgrade by MacManSuite

    Device: Late 2015 - 17.1 - MK462LL/A (3.2Ghz i5-6500)
    Blade upgrade: 32GB Blade -> 2TB Sabrent Rocket NVMe PCIe M.2 2280
    Speed test: 2700 MB/s read, 2700 MB/s write
    OS: Mojave 10.14.4
    Location: UK, Europe
    Adapter: Sintech ST-NGFF2013 (I did have to cut this slightly so the NVMe sat flat rather then slightly bent)
    Issues after fresh OS install:
    sleep disabled & hibernation enabled


    Blade + HDD upgrade by MacManSuite

    Device: Late 2013 -14.2 (3.5Ghz i7-4771)
    Blade upgrade: 128GB SDNEP 655-18378 -> Intel 660P 2TB (SSDPEKNW020T8X1)
    HDD upgrade: 3TB SATA ST3000DM001 HDD -> 4TB SATA ST4000DMZ04 HDD (Cold storage)
    Speed test: 750 MB/s read, 750 MB/s write
    OS: Mojave 10.14.4/10.14.5
    Location: UK, Europe
    Adapter: Sintech ST-NGFF2013

    Issues after fresh OS install: working with NO tweaks to sleep mode, no crashes when resuming. Tested under both 10.14.4 and 10.14.5 with no issue


    Blade+HDD upgrade by mdelrossi

    Device: Late 2014 - 15.1 (4.0Ghz i7-4790K)
    Blade upgrade: 128GB Blade -> Intel 660P 1TB
    HDD upgrade: HDD -> 2TB SSD Sandisk SDSSDH3-2T00-G25
    OS: Mojave 10.14.5
    Location: US, North America
    Adapter: Sintech ST-NGFF2013-C
    Issues after fresh OS install:
    Flawless. Goes to sleep, wakes up no terminal command. Clean install, then migrated from existing T5 that I was using as main boot drive.


    Blade upgrade by ProteoMX

    Device: iMac Late 2013 - 14.2 - ME089LL/A (3.4Ghz i5-4670)
    Blade upgrade: none -> Samsung 970 PRO 512GB (MZ-V7P512BW)
    Speed test: 780 MB/s read, 738 MB/s write.
    OS: Mojave 10.14.5
    Location: Venezuela, South America

    Adapter: Sintech NGFF M.2 nVME SSD (came in black color, branded as RoHS)
    Issues after fresh OS install: sleeps seems to be working just fine, I can hit the "Sleep" menu entry, leave the machine alone for a while and when I press the keyboard it just comes back to life and keeps working as usual


    Blade+HDD upgrade by macmanss

    Device: Early 2019 - 19.1 - MRR12LL/A (3.0GHz i5-8500)
    Blade upgrade: 32GB Blade -> 2TB Samsung 970 EVO NVMe SSD
    HDD upgrade: 1TB SATA HDD -> 1TB Samsung 840 EVO SATA SSD (old model)
    Speed test: 2900 MB/s read, 2520 MB/s write
    OS: Mojave 10.14.5
    Adapter: Sintech ST-NGFF2013-C
    Location: Sydney, Australia
    Temperature sensor: none
    Issues after fresh OS install:
    none, sleep/wake works fine, no loud fans


    Blade upgrade by iaanda

    Device: Mid 2017 - 18.3
    HDD upgrade: 32GB Blade -> Intel 760P 512GB
    Speed test: around 900 MB/s read, 2900 MB/s write
    OS: Mojave 10.14.3
    Location: New Zealand
    Issues after fresh OS install:
    None
     
  2. mbosse macrumors 6502

    Joined:
    Apr 29, 2015
    Location:
    Vienna, Austria
    #2
    Will do once completed.
     
  3. dobrink, Dec 30, 2018
    Last edited: Feb 27, 2019

    dobrink thread starter macrumors member

    dobrink

    Joined:
    Feb 4, 2013
    Location:
    Helsinki, Finland
    #3
    There are several upgrades from other discussions:


    Blade drive upgrade by Jeden87

    Device: Late 2015 - 17.1 - MK472LL/A (3.2Ghz i5-6500, Fusion HDD+16GB blade)
    Blade upgrade: 24GB Blade -> 512GB Samsung 970 Pro NVMe SSD
    Speed test: 2900 MB/s read, 2200 MB/s write
    Adapter: Sintech ST-NGFF2013
    Issues after fresh OS install: the blade drive does not wake up from sleep, have to restart, or disable sleep entirely


    Blade drive upgrade by MKhan

    Device: Late 2013
    Blade upgrade: ?? blade -> 512GB Samsung 970 Pro NVMe SSD
    Speed test: 756 MB/s read, 756 MB/s write
    Adapter: KALEA-INFORMATIQUE
    Issues after fresh OS install: the blade drive does not wake up from sleep, have to restart, or disable sleep entirely


    Blade upgrade by ssdaytona

    Device: Late 2015 - 17.1 - MK472LL/A (3.2Ghz i5-6500, Fusion HDD+16GB blade)
    Blade upgrade: 24GB Blade -> 512GB Samsung 970 Pro NVMe SSD
    CPU upgrade: i5-6500 -> i7-6700K
    Speed test: 2930 MB/s read, 2170 MB/s write
    Adapter: Sintech ST-NGFF2013 and ST-NGFF2013-C
    Issues after fresh OS install: sleep issues with both adapters, have to disable sleep
     
  4. Tommy c macrumors 6502

    Tommy c

    Joined:
    Sep 9, 2012
    Location:
    Pocono PA
    #4
    I thought I could not upgrade the internal HD to these NVME SSD's Mine came with a 1TB standard HD.
     
  5. mbosse macrumors 6502

    Joined:
    Apr 29, 2015
    Location:
    Vienna, Austria
    #5
    Its definitely possible with the 27" version.
     
  6. Tommy c macrumors 6502

    Tommy c

    Joined:
    Sep 9, 2012
    Location:
    Pocono PA
    #6
    I emailed one these iMac repair places I seen on youtube. I gave them my serial number and they said I can only do SATA SSD upgrade. Nothing about the NVME SSD. Thats a whole different ballgame then.
     
  7. mbosse macrumors 6502

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    Apr 29, 2015
    Location:
    Vienna, Austria
    #7
    Which vintage did you inquire about? A 2012? Then they are right about SATA (but even these models had an Apple-specific blade SSD port, just in the older SATA version).
     
  8. Tommy c macrumors 6502

    Tommy c

    Joined:
    Sep 9, 2012
    Location:
    Pocono PA
    #8
    Right now, I'm running the Samsung T3 SSD as an external
     
  9. mbosse macrumors 6502

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    Apr 29, 2015
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    Vienna, Austria
    #9
    You can definitely upgrade to NMVe. I have the very same and can confirm first hand (I'd edit out your serial number...). Magnus
     
  10. Tommy c macrumors 6502

    Tommy c

    Joined:
    Sep 9, 2012
    Location:
    Pocono PA
    #10
    I took it off. I did not even think of it. Ok, so is it easy to upgrade to that NVME? I like that 2900/2300 read/ write speeds. Can you upgrade the GPU?
     
  11. mbosse macrumors 6502

    Joined:
    Apr 29, 2015
    Location:
    Vienna, Austria
    #11
    "Easy" is relative for the late 2012 and younger iMac, as the iFixit guide will show. Yes, such speeds are feasible. I don't think the GPU is upgradeable, the CPU certainly is.
     
  12. Tommy c macrumors 6502

    Tommy c

    Joined:
    Sep 9, 2012
    Location:
    Pocono PA
    #12
    Honestly, That would be worth it to upgrade that and the CPU to open it. I'm seeing there are complications with upgrading with the computer sleeping. I was reading the top comments.

    I'm just afraid to open this up. I wish you guys lived around here.
     
  13. dobrink, Jan 1, 2019
    Last edited: Feb 27, 2019

    dobrink thread starter macrumors member

    dobrink

    Joined:
    Feb 4, 2013
    Location:
    Helsinki, Finland
    #13
    That was why I created the thread. For people who want to know what tools they need, and what the results are gonna be on a certain iMac model.

    All updates are summarized >here< in the first post of the thread.
     
  14. mbosse macrumors 6502

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    Apr 29, 2015
    Location:
    Vienna, Austria
    #14
    Tools: I use my old frequent flyer card and suction cups from the bathroom ...;-)
     
  15. Tommy c macrumors 6502

    Tommy c

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    Sep 9, 2012
    Location:
    Pocono PA
    #15
    I know ifixit has a kit for doing this disassembly and new double sided tape strips.
     
  16. dobrink thread starter macrumors member

    dobrink

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    Feb 4, 2013
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    Helsinki, Finland
    #16
    ifixit is expensive, I am trying to find to the cheapest working solutions
     
  17. Tommy c macrumors 6502

    Tommy c

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    Pocono PA
    #17
    Ahh, ok. Understood.
     
  18. jdee2wheels, Jan 6, 2019
    Last edited: Jan 6, 2019

    jdee2wheels macrumors member

    Joined:
    Aug 15, 2007
    #18
    Blade drive and Spinning drive upgrade

    Device: Base model Mid 2017 27"
    Blade SSD upgrade: 1TB Samsung 970 Evo NVMe SSD
    SATA SSD upgrade: SanDisk 2TB 3D SATA III 2.5" Internal SSD

    Speed test: 2500 write, 2900 read for Blade, 450ish for SATA SSD
    OS: Mojave 10.14.2
    Adapter:
    Sintech NGFF M.2 nVME SSD Adapter Card, OWC temperature sensor for SATA SSD

    Issues after fresh OS install: None


    Took a few hours to do this install, but everything appears to be working well and the computer sleeps fine. It was a little nerve racking pulling a brand new iMac apart but it saved a ton of money over getting a 1TB SSD from apple and really I like having another internal 2TB drive for my photos instead of using an external.

    A few more notes:
    - I didn't have any issues with dust getting behind the screen after it was back together
    - The sintech adapter and new Samsung blade SSD fit well, and lined up perfectly with the original screw hole. Just use the same screw that secured the original blade SSD.
    - The screen adhesive strips from OWC don't seem to line up perfectly with the alignment holes on this model iMac but that didn't really cause an issue. Getting the screen back on was the hardest part for me though.
    - I used an ifixit tear down from here, which was missing two important points, perhaps because it was showing a 2015 tear down:
    - There is a very small, thin ribbon cable on the logic board that needs to be disconnected before removing it out of the body of the iMac (step 54).
    - The airport radio connectors (step 48) now have a metal band that secures them to the airport card. You need a very small torx screw to remove them which I didn't have at first - can't remember the size.

    Hope this helps!
     
  19. uller6, Jan 9, 2019
    Last edited: Jan 10, 2019

    uller6 macrumors regular

    uller6

    Joined:
    May 14, 2010
    #19
    I'll add my experience here, as I've successfully upgraded a few iMacs to SSDs. As many of the iMac's I've dealt with have physical HDD temperature sensors controlling the HDD fan, you need to download a fan control program to prevent the fans from going crazy when you swap in the SSD. I use Macs fan control (https://www.crystalidea.com/macs-fan-control):

    Spinning drive upgrades

    1)
    Device:
    iMac 27" Late 2009 i7
    SSD upgrade: TB HDD -> Crucial M550 256 SSD
    Speed test: 280 MB/s read, 250 MB/s write
    OS: High Sierra 10.13.6

    Temperature sensor: none - disconnected cable from old HDD
    Issues after fresh OS install: HDD fan spins like crazy due to no temperature readings from HDD sensor
    What to do: download Macs fan control to tame HDD fans

    2)
    Device:
    iMac 27" Late 2014 i7
    SSD upgrade: 1T Fusion Drive -> Crucial M500 2T SSD + 128 Gb Apple Blade SSD (from fusion drive)
    Speed test: 500 MB/s read, 480 MB/s write
    OS: High Sierra 10.14.2

    Temperature sensor: none
    Issues after fresh OS install: none - everything works perfectly
    What to do: nothing - everything works perfectly

    3)

    Device: iMac 27" Late 2011 i7
    SSD upgrade: 1T HDD -> Intel 330 SSD 180 Gb
    Speed test: N/A
    OS: High Sierra 10.13.6

    Temperature sensor: none
    Issues after fresh OS install: HDD fan spins like crazy due to no temperature readings from HDD sensor
    What to do: download Macs fan control to tame HDD fans
     
  20. mbosse macrumors 6502

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    Apr 29, 2015
    Location:
    Vienna, Austria
    #20
    (2) is interesting - no fan problems without a genuine Apple HDD on a 27" 2015 iMac?

    Thanks,
    Magnus
     
  21. uller6 macrumors regular

    uller6

    Joined:
    May 14, 2010
    #21
    That’s right! I was awfully surprised when I found out! But, I made a typo before; it was actually a late 2014 iMac 5k. Fixed in original post.
     
  22. mbosse, Jan 11, 2019
    Last edited: Jan 12, 2019

    mbosse macrumors 6502

    Joined:
    Apr 29, 2015
    Location:
    Vienna, Austria
    #22
    Blade drive upgrade

    Device: late 2013 i7 (ME088)
    SSD upgrade: 1TB HDD -> 2TB Samsung 970 Evo NVMe SSD
    Speed test: 780 MB/s read, 730 MB/s write
    OS: High Sierra 10.13.6
    Adapter: Sintech ST-NGFF2013

    Issues after fresh OS install: the computer does not go to sleep
    What to do: sleep issue unacceptable for me given minor speed boost, thus replaced Samsung blade and installed Fusion Drive with original Apple parts, sold iMac
    --- Post Merged, Jan 12, 2019 ---
    Those screwed airport connectors were on my Late 2015 as well. Seems to be a minor revision that made its way into the iMac somewhere in between.

    Best,
    Magnus
     
  23. dobrink, Feb 20, 2019
    Last edited: Feb 27, 2019

    dobrink thread starter macrumors member

    dobrink

    Joined:
    Feb 4, 2013
    Location:
    Helsinki, Finland
    #23
    HDD + CPU upgrade

    Device: Late 2013 - 14.2 - ME088LL/A (3.2Ghz i5-4570, HDD only)
    HDD upgrade: 1 TB SATA HDD -> 1TB Samsung 860 Evo SATA SSD
    CPU upgrade: i5-4570 -> i5-4670K
    Speed test: around 500 MB/s read, 500 MB/s write
    OS: Mojave 10.14.3
    Temperature sensor: none
    Issues after fresh OS install: everything is ok with the fan, OWC temperature sensor NOT required!

    I have successfully performed a CPU and SSD upgrade on the basic model 27" iMac late 2013. Please note that you do NOT need the OWC temperature sensor, because the fan works just like before with its normal rpm.

    Hypothesis 1: The newest OS X firmware has eliminated this issue so the temperature control no longer triggers the fan to spin at max rpm.
    Hypothesis 2: Only when upgrading both the blade SSD and the HDD the iMac gets no temperature reading and thus the fan problem appears. Should either upgrade just the HDD on a fusion model, or on a HDD-only model in order to not need the OWC's temperature sensor.

    Please refer to the first post in this thread for the tools needed for the upgrade.


    Issues encountered:

    -It is extremely challenging to screw the spring of the CPU heatsink back. If tightened too much it physically bents the CPU so that not all the pins touch the motherboard's socket. A strange electric sound was coming out of the CPU area. It took me hours to diagnose and repair the problem. I had to use pliers to straighten back the CPU. Wasted a lot of thermal paste after each disassembly/reassembly. Eventually screwed the spring very little, but better a loose working CPU than a tightened disfunctional one.
    -The display cable got a bit damaged around its inserting point to the socket on the motherboard because it is delicate and I had to connect/disconnect it may be 20 times. It is easier, I think, if you would disconnected its other end (the one connected to the LCD).
    -The DC inlet is very stubborn to disconnect, you have to pull with force and my fingers almost bled cos I had to do it multiple times.
    -If putting/upgrading a blade drive from a non-Fusion iMac model you need a small screw which would secure the adapter+blade in place. It has to be slightly thicker than a normal stock Windows laptop case philips screw and preferably with a wider head.
    -When unscrewing the motherboard's hidden T10 screw, you need a thin screwdriver that would go through the opening.
    -When screwing the two T10 screws on the heatsink's side you need a short and thin T8 screwdriver in order to tighten the two screws properly, the iMac case's curve is on the way of any thick or long screwdriver.
    -Note that the FAN will spin like crazy ONLY IF you do not connect the display cables back (i.e. in case you use an external display to check if everything is fine). The FAN will NOT spin on max rpm because of the newly installed SSD! You do NOT need the OWC temperature sensor.
    -Note when applying thermal paste to the CPU, also put such to the GPU, but NOT to the VRAM modules, since they function differently.
    -Note when putting the display back with the adhesive strips, don't only be careful about side edges's alignment, you have to look that it rests good on the base and there is no distance between it's lower edge and the iMac's base, as when I closed mine there was left a bit of a distance over the iMac logo and the LCD (not a big deal, but still could have been done better)
     
  24. macgeek01 macrumors 6502a

    Joined:
    Apr 2, 2013
    #24
    I’m planning on installing a blade NVME SSD using the Sintech adapter in my 2015 27” iMac to replace the factory AHCI blade. I’m surprised to hear sleep has to be totally disabled because I thought the issue with 3rd party NVME was just with hibernate?
     
  25. dobrink, Feb 20, 2019
    Last edited: Mar 3, 2019

    dobrink thread starter macrumors member

    dobrink

    Joined:
    Feb 4, 2013
    Location:
    Helsinki, Finland
    #25
    You will only have issues with sleep in a 2015 iMac HDD-only model because when installing OS X its bootrom is not patched by default to work with all NVMes. If in any case you are having issues you disable sleep (and its trigger standby), you set hibernatemode to 25, the autopoweroff can be 1. The Mac will sleep and wake normally. For reference here.
     

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186 December 27, 2018