iMac 5K 27" Late 2015

Discussion in 'iMac' started by FabLn, Jan 19, 2016.

  1. FabLn macrumors newbie

    FabLn

    Joined:
    Jan 9, 2016
    #1
    Hello :)

    Im looking to upgrade the memory of my newly bought Imac 5K 27" Late 2015
    It says that memory needs to be 1867MHZ

    But looking on some website they sell only 1866MHZ selling its working great

    Anyone using it ? Any feedback ?

    Thanks a lot
     
  2. bogg, Jan 19, 2016
    Last edited: Jan 19, 2016

    bogg macrumors 6502

    bogg

    Joined:
    Apr 12, 2005
    Location:
    Sweden
    #2
    It's just 1866,666 rounded differently, Apple rounds up, the rest of the industry rounds down. As is usually the case when it is Apple and components needing to sound just a little bit better than they really are :)

    2133 will work well as well

    Go for 1866 or 2133 with CL11 Or lower
    Apple ships with 1866 cl13 iirc

    Either should work fine
    --- Post Merged, Jan 19, 2016 ---
    Thread about 2133MHz ram:

    http://forums.macrumors.com/threads/2133mhz-ram-test-results.1929801/
     
  3. bogg macrumors 6502

    bogg

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  4. Erdbeertorte macrumors demi-goddess

    Erdbeertorte

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    #5
  5. FabLn thread starter macrumors newbie

    FabLn

    Joined:
    Jan 9, 2016
    #6
    Thanks a lot for your feedback1
     
  6. FabLn thread starter macrumors newbie

    FabLn

    Joined:
    Jan 9, 2016
    #7
    Thanks a lot I will check right away
    --- Post Merged, Jan 20, 2016 ---
    And so I understand to install an SSD in this case a 1To Samsung Evo, I need to get new adhesives to seal back the IMac but can't find the correct reference anywhere and a Drive adaptor 2.5" to 3.5"!
     
  7. Erdbeertorte macrumors demi-goddess

    Erdbeertorte

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    #8
    If you really want to do that yourself instead of using an external drive for not losing your warranty and accidentally damaging something, I would look at first here to decide if it's worth it:

    https://www.ifixit.com/Guide/iMac+Intel+27-Inch+Retina+5K+Display+Hard+Drive+Replacement/30522
     
  8. FabLn thread starter macrumors newbie

    FabLn

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    Jan 9, 2016
    #9
    Won't I loose any speed having the SSD 1To Samsung Evo connected as external ?
     
  9. Erdbeertorte macrumors demi-goddess

    Erdbeertorte

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    Location:
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    #10
    Yes with USB it's a little slower and you can't use Trim. Maybe a good Thunderbolt 2 adapter/enclosure/dock can run it at full speed.
    But they are expensive and I have no experience with that. I just have an old adapter with USB 3.0 and Thunderbolt 1 and there is not much difference in speed when I connect it to Thunderbolt instead of USB if I remember it correctly. But it's long ago that I tested that and it was an HDD.

    I could make a speed test with a 500GB Samsung EVO 850 connected to Thunderbolt and post the result. USB 3.0 is not working on my iMac at the moment because Apple seems to be too stupid to fix that long known issue with the new iMacs in every Beta, also my adapter is from an HDD enclosure and has no UASP, what makes SSDs connected to USB faster.
     
  10. maflynn Moderator

    maflynn

    Staff Member

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    Location:
    Boston
    #11
    Checkout iFixit's tear down. Its not an easy process to open up an iMac and it being new, I highly recommend you avoid this. As mentioned use an SSD externally if you want more SSD speed and the best way to do that is to use a thunderbolt enclosure.
     
  11. FabLn thread starter macrumors newbie

    FabLn

    Joined:
    Jan 9, 2016
    #12
    Thanks a lot for your feedback !
    --- Post Merged, Jan 20, 2016 ---
    Thanks a lot - will be nice to see the results !
    --- Post Merged, Jan 20, 2016 ---
    Can I boot the iMac 5K 27" Late 2015 from SSD connected as external drive ?
     
  12. Daisy81 Suspended

    Daisy81

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    Dec 29, 2015
    Location:
    Virginia
    #13
    I am fairly sure you can. I had a room mate in college back in the days of OS X 10.2 that was using external drives as the boot drive. :D
     
  13. Sirmausalot macrumors 6502a

    Sirmausalot

    Joined:
    Sep 1, 2007
    #14
    Yes, from either Thunderbolt or USB. Even though the internal NVRAM drive on the iMac is rated as faster (2.5X at that) to a traditional SSD, you'd be hard pressed to tell the difference.
     
  14. FabLn thread starter macrumors newbie

    FabLn

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    Jan 9, 2016
    #15
    How to proceed to boot from the SSD in external ?
     
  15. maflynn Moderator

    maflynn

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    Boston
    #16
    Hold the option key while its booting, you'll get a boot menu, or within the system preferences, click on the startup disk preference.
     
  16. FabLn thread starter macrumors newbie

    FabLn

    Joined:
    Jan 9, 2016
    #17
    Connected the 850 EVO 1Tb as external with an Inateck case - should be USB 3 but don't speed up over 37MB/S
    How is that possible ?
     
  17. maflynn Moderator

    maflynn

    Staff Member

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    #18
    Maybe a poor or defective chipset, might not be usb3.
     
  18. FabLn thread starter macrumors newbie

    FabLn

    Joined:
    Jan 9, 2016
    #19
    Any recommendation for a Thunderbolt adapter box good value ?
     
  19. joogle macrumors newbie

    Joined:
    Nov 9, 2015
    #20
    I am going to add to your thread as I have the same type of question. I am looking for a small form factor external USB enclosure for a SSD, mSATA, or other device that I can use as a boot up device. I want it to be small so I can possibly stick it somewhere behind the monitor or hand so it is not visible from the front.

    I read on another thread, I can't now find where it is but someone used this enclosure with a mSata and got like speeds of 480 Mbps

    http://www.amazon.com/Sabrent-Enclosure-Adapter-Support-EC-UKMS/dp/B00LRZPNHM/ref=cm_cr_pr_product_top?ie=UTF8
     
  20. mtbdudex macrumors 68000

    mtbdudex

    Joined:
    Aug 28, 2007
    Location:
    SE Michigan
    #21
    I'm getting speeds of 115 MB/s with my NAS and WD EX2100, bare 2 bay case is $215....

    Also - I spent $85 and got 16GB here, so added that to my existing 8GB gave 24GB
    http://www.amazon.com/gp/product/B00DSGLMSM
    Crucial Ballistix Sport 16GB Kit (8GBx2) DDR3 1866 (PC3-14900) 204-Pin SODIMM Memory BLS2K8G3N18AES4 / BLS2C8G3N18AES4
     

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