Poor SSD transfer rates

Discussion in 'Mac Pro' started by longmover, Mar 12, 2012.

  1. longmover macrumors member

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    #1
    Hi all, apologies if this has been covered but I have tried searching and not found my issue. Basically I've got an 08 MP and I've chucked in a Vertex 3. I cloned my original OS drive and it is certainly much much faster but any transfer benchmarks I run show a maximum of 175MB/s read and/or write. I'm also using this card which should give me SATA 3 speeds. Any ideas?
     
  2. simsaladimbamba

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    #2
  3. longmover thread starter macrumors member

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    #3
    Thanks for the quick reply, I'd already tried all those benchmarks, here they are again run just now (slightly faster it seems but still not what I would expect)

    Screenshots
     
  4. simsaladimbamba

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    #4
    What does :apple: > About This Mac > More Info > System Report > Hardware > Serial ATA > Negotiated Link Speed say?
     
  5. longmover thread starter macrumors member

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    #5
    6 Gigabit

    Could cable length make a difference? I have it installed in the spare optical bay via a long(ish) cable, possible culprit? I would have thought that if it was too long it would have negotiated to a slower speed...
     
  6. simsaladimbamba

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    #6
    Does the Vertex 3 have the latest firmware?

    Have you also looked/asked here? Maybe you need a Mac Pro specific firmware upgrade, I needed one for my Vertex 3 and a 2009 MBP.
     
  7. nambuccaheadsau macrumors 6502a

    nambuccaheadsau

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    #7
    Purchased several OWC and Kingston SSD's, both 3GB and 6GB transfer rates. OWC technicians are adamant that an SSD should not be cloned from a platter drive, something to do with speed. Their suggestion is to format Mac OS Extended (Journalled), select as GUID option, and do a clean OS install, transfer over settings using Migration Assistant and updating to latest software update.
     
  8. GermanyChris macrumors 601

    GermanyChris

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    #8
    When I called OCZ that was their first question...

    Fresh install did wonders..
     
  9. cluthz macrumors 68040

    cluthz

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    #9
    How is the speed connected thru the sata2?

    I have an old vertex turbo. It benches 230/170 with AJA on SATA2, vertex 3 should more than double that.
     
  10. wonderspark macrumors 68030

    wonderspark

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    #10
    I have a Crucial M4 256GB that is supposed to get 500MB/sec read, 260MB/sec writes on my internal SATA II bay, and it gets 266MB/sec read, 230MB/sec write on the AJA disk speed test, so I would guess I'm just barely being throttled on writes, but heavily throttled on reads. I'm happy with it as is, though, since it's nowhere near throttling the random 4K numbers.
     
  11. GermanyChris macrumors 601

    GermanyChris

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    #11

    Remember the M4 is SATA 3.
     
  12. wonderspark macrumors 68030

    wonderspark

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    #12
    Yeah, and if I feel the need, I can switch it to my SATA 3 card, but for now it's not necessary.
     
  13. GermanyChris macrumors 601

    GermanyChris

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    #13
    The real world performance difference between SATA 2 and 3 isn't noticable in my experience.
     
  14. wonderspark macrumors 68030

    wonderspark

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    #14
    We're on the same page, my brother from another mother! :p
    I was just posting my numbers for perspective and reference. I'm totally happy with the M4 in SATA 2.
     
  15. derbothaus, Mar 13, 2012
    Last edited: Mar 13, 2012

    derbothaus macrumors 601

    derbothaus

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    #15
    That is funny as I cloned (.dmg) my HDD to OWC 6G on SATAII internal link in Mac Pro and this is what I have got for at least last 8 months. I call BS on OWC's platter image thing. I am saturating always. SSD is 40% full ATM.
     

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  16. longmover thread starter macrumors member

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    #16
    Thanks for your help everyone, when i get a chance I'll try a clean install and see if that makes a difference.
     

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