Any 27" Late 2015 iMac SSD Benchmarks?

Discussion in 'iMac' started by Kappsi, Oct 16, 2015.

  1. Kappsi macrumors newbie

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    Oct 16, 2015
    #1
    I ended up ordering an i7/M395 256GB SSD, but I'm rather worried about whether the SSD performance would be significantly slower than the 512GB, particularly as I've heard mixed things. Has anyone actually run benchmarks like Black Magic on these and is able to post them so we can see the difference? It would be much appreciated.
     
  2. Serban Suspended

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    Jan 8, 2013
    #2
    i think they use the same ssd of last year..so around 700mb read and write
     
  3. DanR16 macrumors member

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    Mar 19, 2012
    #3
    No, they have Pcie drives which should be 2.5x faster
     
  4. Serban Suspended

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    #4
    last year also are Pcie, my 5k imac has it and my 512 SSD runs at around 700mbs read and write
     
  5. DanR16 macrumors member

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    Mar 19, 2012
    #5
    Apples website says:
    "For maximum performance, you can configure iMac with up to 1TB of PCIe-based flash storage that’s now up to 2.5 times faster than the previous version.2 Delivering up to 1800 Mbps of sequential read performance, pure flash storage is the fastest way to speed through the most demanding tasks"
     
  6. Serban Suspended

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    Jan 8, 2013
    #6
    but yes , seems that the current SSD from 4k and 5k imac can reach around 1600-1800mbs
     
  7. Sirmausalot macrumors 6502a

    Sirmausalot

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    Sep 1, 2007
    #7
    I read that each size ssd is a bit faster than the other, but it didn't seem significant. That said, I think you will be unhappy with the size of your ssd. If you can swing it, you should cancel and reorder with the larger size. If money is tight, hold off on a RAM upgrade.
     
  8. gsingham macrumors 6502

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    Oct 20, 2013
    #8
    We'll find out in 2-3 days when the first few btos arrive
     
  9. huffy15 macrumors regular

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    Montreal, Canada
    #9
    I run a macbook pro with a 64gb ssd for 4 years now. I use my computer as an instance of osx. I don't have any precious content on it; just software. 256gb is enough at that price.
     
  10. topgunn macrumors 65816

    topgunn

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    #10
    Here is a QuickBench test on the new 27" with a 2TB Fusion drive. This is a fresh install so it is only testing the SSD although you can tell from the write speeds that there is some logic going on behind the scenes that slows it down; likely to see whether the data should be written to the HDD or the SSD.

    [​IMG]
     
  11. gsingham macrumors 6502

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  12. mikeboss macrumors 65816

    mikeboss

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    #12
    I don't think that there's anything going on in the background. the Fusion Drives of the late 2015 iMac have SSDs with only 24 or 32 GB capacity. they simply can't take (write) more than 650 MB per second.
     
  13. Winfield macrumors newbie

    Winfield

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    Aug 17, 2015
    #13
    1TB FDs have 24GB SSDs, but 2TB and 3TB FDs still have 128G SSDs.
     
  14. kdochert macrumors member

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    Apr 6, 2013
    #14
    Do the new fusion drives also use the new PCIe flash?
     
  15. mikeboss macrumors 65816

    mikeboss

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    #15
    I didn't know that. you're 100% right!
     
  16. mikeboss macrumors 65816

    mikeboss

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  17. Kappsi thread starter macrumors newbie

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    Oct 16, 2015
    #17
    Thanks! If the 128GB from a Fusion drive can reach these read speeds, the 256GB should certainly be able to.

    This does make my decision of 256 vs 512 rather harder though. :p I have a second computer that I'd expect to use for gaming (except perhaps at LANs), while using this one for browsing and programming. 256 is almost certainly fine, particularly since I could use an external SSD later, but that speed is just fantastic...
     
  18. KenAFSPC macrumors 6502a

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    Sep 12, 2012
    #18
    Could someone with a late 2015 27" iMac with the 512GB SSD provide benchmarks?
     
  19. gsingham macrumors 6502

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    Oct 20, 2013
    #19
    They havent even arrived. Will be here in the Nxt 2 dsys
     
  20. AusMacFan macrumors member

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    Jul 31, 2010
    #20
    That's very strange, my late 2015 27" 2TB fusion drive only scored up to around 700MB/s read/write on backmagic, but maybe blackmagic is just behaving weirdly. Do you mind sharing a screenshot of the details of your drives in system report?
     
  21. The Doctor11 macrumors 603

    The Doctor11

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    #21
  22. ericv macrumors regular

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    Mar 31, 2015
    #22
    He tested the 2TB fusion drive. His theory is that his test is only hitting the SSD in the fusion drive. It would be faster as the late 2015 iMac uses a faster SSD.
     
  23. gsingham macrumors 6502

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    Oct 20, 2013
    #23
    What?!? He's saying he has the same setup but getting only 700mb/sec speeds

    Ausmacfan that look likes x2 link speeds not x4 like the other speed tests here
     
  24. AusMacFan macrumors member

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    Jul 31, 2010
    #24
    Ok so I just booted up blackmagic and let it run for a little bit longer this time. It looks like what is happening is the stress file transfer is completing too quickly for the 'read' speed meeter to get to the actual speed that the drive is working at, and while leaving it on, it continually reaches higher speeds until the HDD kicks in and slows it right down, so I never actually see the meter go to speeds like 1600MB/s. However, the 'how fast' columns are showing speeds on par with dezza85.
     

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  25. Kappsi thread starter macrumors newbie

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    Oct 16, 2015
    #25
    Well, I cancelled my 256GB and am going to reorder the 512GB. The SSD speed is too nice to use an external, and the upgrade price is surprisingly reasonable. Unfortunately since the previous charge will still apply to my credit limit, which is too low to be able to order until that's gone, looks like I'll not only lose my place in the queue but then also have to wait a few extra days as well. The Apple Store FAQ says:
    Does anyone have any experience with how long it usually takes, or what that request to remove the authorization is?
     

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