Mac mini (late 2014) 1.0 TB SSD: how many PCIe lanes?

Discussion in 'Mac mini' started by mikeboss, Feb 1, 2015.

  1. mikeboss macrumors 65816

    mikeboss

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    #1
    I've used up all my google-fu and I failed miserably... it seems impossible to find this information anywhere. is the 1.0 TB SSD in the new Mac mini connected using two or four PCIe lanes?
     
  2. Glenn.eu, Feb 1, 2015
    Last edited: Feb 1, 2015

    Glenn.eu macrumors member

    Glenn.eu

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    #2
    I expected 4 lanes and it to hit 1 GB/s but this is the max i'm getting on my Mac mini 2014 1TB ssd blade. (Don't know how many lanes it has)

    [​IMG]



    It does state link width 2x (maybe that indicates how many lanes?)

    [​IMG]
     
  3. AFEPPL macrumors 68030

    AFEPPL

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    #3
    if you look in the system report doesnt it tell you?

    Apple SSD Controller:

    Vendor: Apple
    Product: SSD Controller
    Physical Interconnect: PCI
    Link Width: x2
    Link Speed: 5.0 GT/s
    Description: AHCI Version 1.30 Supported

    My 512GB is running at 708MB/s for write and 732MB/s for read.
     
  4. mikeboss thread starter macrumors 65816

    mikeboss

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    #4
    thank you guys! yep, definitely two PCIe lanes. bummer. I was hoping for four...
     
  5. redheeler macrumors 603

    redheeler

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    #5
    Yes, that definitely looks like two lanes. Same speeds I get on the 512 GB in my iMac.
     
  6. yjchua95 macrumors 604

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    #6
    The reason why there's only 2 PCIe lanes available is because the other two PCIe lanes are occupied by Ethernet and the extra 2 USB ports.

    On rMBPs, there's only 2 USB ports and no Ethernet port, so 4 lanes are available for the SSD. On the Mac Mini and iMac, 2 lanes are taken up by an extra 2 USB ports (4 USB ports in total) and the Ethernet port, so only 2 lanes are left for the SSD.
     
  7. mikeboss thread starter macrumors 65816

    mikeboss

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    #7
    I think you're looking in the right direction. but I guess it's the second Thunderbolt port which is eating up the remaining PCIe lanes.
     
  8. yjchua95 macrumors 604

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    #8
    Nope, it's not.

    The rMBPs all have 2 Thunderbolt ports as well, but have 4 lanes for the 1TB SSD.
     
  9. mikeboss thread starter macrumors 65816

    mikeboss

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    #9
    you're right! I wasn't aware that the MacBook Pros do have two TB ports. so it's clearly the NIC & USB using the PCIe lanes.
     
  10. BeatCrazy macrumors 65816

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    #10
    That's about the speed I get on mine, as well. One day I'll consider replacing the FD with just a single 1TB PCIe stick. I imagine speeds will stay about the same?

    One thing is certain, the PCIe allows for 1.5-2X the speeds you can hit on a 2012 mini or older with SATAIII. :p
     
  11. qcmacmini macrumors 6502

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    #11
    Not quite 1.5x if you buy an SSD that can saturate SATA3 :)

    I get 520MBps read on mine.
     
  12. waveboreale macrumors member

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    #12
    What ?! Mac Mini 2014 with 1TB SSD is at least 1800€ :eek::eek:
     
  13. redheeler macrumors 603

    redheeler

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    #13
    What a disappointment, I'd trade two USB Ports and an Ethernet port for a faster SSD had I gotten the 1 TB one.

    So a late 2013 or later 13" rMBP fitted with a 4 lane 1 TB SSD would assume 4 lanes? That would be one fast little machine...
     
  14. yjchua95 macrumors 604

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    #14
    You got that straight.

    I wouldn't mind the extra two USB ports and Ethernet, 700MB/s is already fast enough for all my needs, even 4K cinematography.

    I never use wifi in my home and office, it's all connected via Ethernet, plus I use wired peripherals for security.
     
  15. BeatCrazy macrumors 65816

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    #15
    True, but if you're talking about 'maxing out' things... the 2014 mini can take one of those newest PCIe 1TB drives, that would probably top out around 900/900MB/s read and write.
     
  16. qcmacmini macrumors 6502

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    #16
    Yeah but with x2 lane PCIe, it's not going to happen :)
     
  17. BeatCrazy macrumors 65816

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    #17

    Why not? Each PCIe lane supports up to 500MB/s. With faster drives, it is very likely we'll see 900MB/s, soon.
     
  18. yjchua95 macrumors 604

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    #18
    Apple uses a PCIe connection with a x2 link width, giving a total of 5 GT/s.

    PCIe 2.0 1x can handle 5 GT/s, and in System Information, the link speed is 5 GT/s. Since PCIe 2.0 requires 10 bits to encode 8 bits of data, 5 GT/s converted to Gbps (gigabits) would be 5*(8/10) = 6.25 Gbps. Divide by 8 to get GB/s = 0.78125 GB/s. Multiply by 1024 to get MB/s = 800 MB/s.

    So there you go.
     
  19. paulrbeers macrumors 68040

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    #19
    Super fast sequential read/writes are really only necessary in servers providing data to multiple end users and 4K video production. The average user should care more about small random read/writes. This is the realm that most of us spend our lives in.

    Sequential Read/writes are just for proving who's #$%& is bigger.

    /sarcasm
     
  20. BeatCrazy macrumors 65816

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    #20
    Thanks for the explanation and breakdown :cool:

    Any idea what the max transfer speed I can expect between my 2013 Mac Pro, and 2014 mini via TB2? Assume the file goes to the mini's SSD.
     
  21. yjchua95 macrumors 604

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    #21
    Theoretical maximum speed of TB2 is 20 Gb/s = 2.5 GB/s.

    In actual practice, if you've got a TB2-TB2 cable from Apple, I'd say you should see around 600-700MB/s, taking into account of the 2 lanes in the Mac Mini.
     
  22. Gav2k, Feb 3, 2015
    Last edited: Feb 3, 2015

    Gav2k macrumors G3

    Gav2k

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  23. BeatCrazy macrumors 65816

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    #23
    Which machine is that from?
     
  24. Gav2k macrumors G3

    Gav2k

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    #24
    Links in post
     
  25. qcmacmini macrumors 6502

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    #25
    This thread is about the 2014 Mac mini and not the rMBP.
     

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