Samsung 840 non-pro SSD good for my Mac Pro?

Discussion in 'Mac Pro' started by Noctilux.95, Sep 2, 2013.

  1. Noctilux.95 macrumors 6502

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    #1
    I have a 2009 Mac Pro 4,1 with 2.66 Quad-Core Xeon.
    Currently have one OWC 240GB 3G SSD and three conventional 7200 RPM HD's.
    I'm interested in purchasing two of the Samsung 250GB 840's. Good choice or should I go with the pro?

    Thanks!
     
  2. flowrider macrumors 601

    flowrider

    Joined:
    Nov 23, 2012
    #2
    ^^^^I am using a Samsung Series 840 500GB SSD with an Apricorn Velocity Solo x2 SATAIII PCIe Card. Here's my post describing it:

    I am still quite happy with my choice, and I am enjoying SATAIII speeds. The card allows me to retain all four of my internal HDDs. My read/write speeds are attached.

    Lou
     

    Attached Files:

  3. Noctilux.95 thread starter macrumors 6502

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    #3
    You're using the non pro 840?
    Both the 840's, pro and non pro are 6G?
     
  4. flowrider macrumors 601

    flowrider

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    #4
    ^^^^Yes, it's the non-pro version, Series 840. You now have another Samsung option that was not available when I bought my SSD. Samsung now has another less expensive alternative to the 840 Pro. It's the 840 EVO. Both the Series 840 and the 840 EVO use TLC memory vs the MLC in the 840 Pro.

    Lou
     
  5. Noctilux.95 thread starter macrumors 6502

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    #5
    I'm not really interested in adding a 6G Sata III pci card. Perfectly happy with the stock 3G. Staying with what i have, which HD would be the best option?
     
  6. flowrider macrumors 601

    flowrider

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    #6
    ^^^^If I was buying now, I'd look at the Samsung 840 EVO.

    Lou
     
  7. RoastingPig macrumors 68000

    RoastingPig

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    #7
    840 non pro 250gb in bay 1 of a 5.1 12 core with icydock and trim enabled
    [​IMG]
     
  8. chris.k macrumors member

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    #8
    I'm using an 840 250Gb. Works very well.

    I recently added a Syba 6Gb PCIe SATA3 caddy card (to achieve the full read speed possible from the drive) and couldn't be happier with the performance. ~430 MB/sec or so on reads.

    Even using the built in SATA2 in the MacPro - the disk yielded similar results to the post above and was a huge I/O increase over my WD Caviar Black HDDs.

    - CK.
     
  9. jakesaunders27 macrumors 6502a

    jakesaunders27

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    #9
    My friend is upgrading to a 240GB non pro for his windows rig and I'm having his 128GB 830 for my Mac Pro is the performance of the 830 similar to 840?
     
  10. InuNacho macrumors 65816

    InuNacho

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    #10
    I got a non-Pro one as well and it sits unattached to anything in my second optical bay. I've bumped into my Pro a few times and frequently plug/unplug stuff and nothings happened.
     
  11. flowrider macrumors 601

    flowrider

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    #11
    Today I got my second Apricorn Solo x2 and a Samsung 840 EVO. The combo is faster than my Samsung 840 results posted above (Post #2).

    Lou
     

    Attached Files:

  12. crjackson2134, Sep 27, 2014
    Last edited: Sep 27, 2014

    crjackson2134 macrumors 68020

    crjackson2134

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    #13
    I actually did something to my 840 Pro that you're not supposed to. I defragged it completely. I saw an instant read performance increase and faster booting. I didn't benchmark for before/after but actual daily usage proved to be a seat of the pants increase. All apps. launched quicker and boot was quicker. This would probably only indicate read performance. I don't really write to this drive often except for video work. In efforts to protect the longevity of the drive, most all writes are done to spinners. I realize that defragging is counter intuitive to longetivity, but I just couldn't help trying it once. I'm glad I did.

    I wonder if the "bug" referred to in the article had something to do with this?
    My next SSD for the MP will be an actual x4 Apple PCIe blade.
     
  13. DPUser macrumors 6502a

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    Jan 17, 2012
    #14
    The consensus around the web appear to be the Samsung TLC NAND needs to be refreshed periodically to maintain read speeds. Defragging tends to move data around on an SSD, thus refreshing some/much/all of the older data.

    I'm sure we'll learn more when Samsung releases the firmware patch, scheduled for October 15.
     
  14. h9826790 macrumors 604

    h9826790

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    #15
    How you did that? I decide to do the same thing actually. My plan is to boot from the backup HDD, and then do a complete defrag by iDefrag.

    I didn't defrag my SSD for about 6 months now. From the analysis, the whole SSD is full of fragment, which will affect the system performance even on a modern SSD. So, I think it's time to perform some maintenance.
     
  15. DPUser macrumors 6502a

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    #16
    Unless you are trying to restore performance to an EVO SSD by refreshing old data to which access has slowed, there is no reason to defrag an SSD of which I am aware.
     
  16. h9826790 macrumors 604

    h9826790

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    #17
    In fact, I just try to copy an old large file from the Evo, it's much slower than the new file. So, I think it's time to perform a full defrag. Which can serve as a temp fix of the Evo bug, also avoid the performance degradation caused by fragmentation at OS filesystem level.
     
  17. crjackson2134 macrumors 68020

    crjackson2134

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    #18
    I booted from a secondary OS X drive then used TechTool to defrag. iDefrag should do just as well.
     
  18. AidenShaw macrumors P6

    AidenShaw

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    #19
    IOs are not free

    For spinners, there's a big cost for track-to-track and rotational latencies needed to access multiple fragments.

    There's also the CPU cost in performing a full IO operation per fragment, and latencies in the PCI/SATA protocols for handling an IO request.

    While the SSD doesn't have mechanical latencies - it has exactly the same per IO CPU/latency costs as a spinner. Severely fragmented SSDs are significantly slower in the real world than SSDs with mostly contiguous files.
     
  19. crjackson2134 macrumors 68020

    crjackson2134

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    #20
    Well, I don't know exactly what the reason was, but it boosted performance significantly.
     
  20. AidenShaw macrumors P6

    AidenShaw

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    #21
    Here's a post where I measured read performance for a fragmented vs contiguous file on an 840 EVO.

    The fragmented file took more than twice as long to read.

    http://forums.macrumors.com/showpost.php?p=19544974&postcount=17
     
  21. crjackson2134 macrumors 68020

    crjackson2134

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    #22
    Glad you ran the numbers. I figured most people here would dismiss my expierence, but the numbers don't lie.
     
  22. AidenShaw macrumors P6

    AidenShaw

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    #23
    By the way, I don't set my SSDs to do automatic or scheduled defragmentation.

    Every few months I check the fragmentation level, and do a manual full disk defrag if there's a lot.

    (And, if I mess up and fill (or nearly fill) an SSD I'll immediately check it. That's the easiest way to get severe fragmentation on any disk.)
     
  23. crjackson2134 macrumors 68020

    crjackson2134

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    #24
    Well no danger of me doing that. I only defragged once, and probably won't need to again for a long while.
     

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