Samsung 840 ssd with macbook pro 2008 does not give the best performance

Discussion in 'MacBook Pro' started by sppl, Dec 13, 2012.

  1. sppl macrumors newbie

    Joined:
    May 9, 2012
    #1
    I have a unibody macbook pro (late 2008) with snow leopard. I replaced my mechanical hard drive with samsung 840 series ssd. I noticed significant speed improvements. I checked the read and write speeds using "Blackmagic Disk speed test" app. I was surprised to find that the actual read/write speeds were less than half as expected.

    Maximum write speed = 130 MB/s
    Maximum read speed = 250 MB/s.

    I also enabled trim using trim enabler app. But I still see the same speeds. Am I missing any optimization/step? Any thoughts are appreciated!
     
  2. aixporter macrumors member

    aixporter

    Joined:
    Feb 21, 2009
    #2
    Is your mac a SATA2 or SATA3? That'll make a big difference in output speed.
     
  3. sppl thread starter macrumors newbie

    Joined:
    May 9, 2012
    #3
    How do I find this?

    This is what I see in About my mac:

    NVidia MCP79 AHCI:

    Vendor: NVidia
    Product: MCP79 AHCI
    Link Speed: 3 Gigabit
    Negotiated Link Speed: 3 Gigabit
    Description: AHCI Version 1.20 Supported

    Samsung SSD 840 Series:

    Capacity: 120.03 GB (120,034,123,776 bytes)
    Model: Samsung SSD 840 Series
    Revision: DXT06B0Q
    Serial Number: S14CNEACA76769D
    Native Command Queuing: Yes
    Queue Depth: 32
    Removable Media: No
    Detachable Drive: No
    BSD Name: disk0
    Medium Type: Solid State
    TRIM Support: Yes
    Partition Map Type: GPT (GUID Partition Table)
    S.M.A.R.T. status: Verified
    Volumes:
    Capacity: 209.7 MB (209,715,200 bytes)
    Writable: Yes
    BSD Name: disk0s1
    Samsung ssd:
    Capacity: 119.69 GB (119,690,149,888 bytes)
    Available: 80.84 GB (80,839,266,304 bytes)
    Writable: Yes
    File System: HFS+
    BSD Name: disk0s2
    Mount Point: /
     
  4. BlazednSleepy macrumors 6502a

    Joined:
    Apr 15, 2012
    #4
    You have sata 2. It's not using the speeds that sata 3 would give you.
     
  5. bobcan macrumors 6502a

    bobcan

    Joined:
    Jan 8, 2007
    Location:
    Sunny but Cold.. Canada
    #5
    Ding Ding Ding..

    Well, first things first.. I have No idea what you 'expected' but since a 2008 MBP is quite likely a Serial ATA 1.5Gb/s bus in that era (as opposed to the newer 3Gb and now 6Gb) I think you have reached its potential.. THe Biggest and Newest SSD will NOT make 'the old car' go any Faster!!

    Take a look here and find your specific model and specs.. I doubt you can expect MORE than where you are at though!! :apple:

    http://www.everymac.com/systems/apple/macbook_pro/index-macbookpro.html
     
  6. BlazednSleepy macrumors 6502a

    Joined:
    Apr 15, 2012
  7. paul-n macrumors regular

    Joined:
    Jul 12, 2012
    #7
    Your Macbook only supports SATA 3 Gb/s, which has a maximum of 250 MB/s, so your read performance is fine, also the 130 MB/s for writing is ok, that is the maximum you get from the 120 GB 840 drive.
     
  8. Blue604 macrumors regular

    Joined:
    Mar 6, 2012
    #8
    Just for comparison, 2009 MBP 13" with M4 512GB Write:205; Read: 267.

    I think yours is normal because 128GB of Samsung 840 write at 130MB/s, the 256GB and 512GB would be higher.
     

    Attached Files:

  9. gianlucadr, Dec 14, 2012
    Last edited: Dec 14, 2012

    gianlucadr macrumors newbie

    Joined:
    Dec 13, 2012
    #9
    Did you activate trim in 840? I don't know if i have to do it
     
  10. sppl thread starter macrumors newbie

    Joined:
    May 9, 2012
    #10
    @gianlucadr...I did enable trim. Didn't notice any difference in speed. Not sure if I need to enable or not.

    ----------

    @Blue604, @paul-n, @BlazednSleepy & @aixporter

    Thanks for your replies.
     
  11. DarwinOSX macrumors 65816

    Joined:
    Nov 3, 2009
  12. Justinhub2003 macrumors regular

    Joined:
    Jul 17, 2012
    Location:
    Cincinnati Oh
    #12
    Its for sure the Sata 2 connection because my 500GB 840 gets:

    315mbps Write
    510mbps Write


    And I have a 2011 MacBook Pro with a SATA III connection.
     
  13. richnyc macrumors regular

    richnyc

    Joined:
    Nov 8, 2012
    Location:
    NYC
    #13
    It's SATA2!!! It is stated clearly in post #3 (Link Speed: 3 Gigabit).

    On another note, you have 120GB model, the 250 and 500GB models are a bit faster. You might be able to get something like 250/160-170 MB/s read/write speeds with 250GB Samsung 840. It won't make any difference for you in day-to-day use.

    I don't think you can make it any faster. Don't worry about it, just use what you got and be happy that it is still miles better than a HDD;)

    PS: And yes, enable TRIM, it'll help over time.

    ----------

    These were pre-production units, they don't sell them to public;)

    The only way you can end up with such unit is if one was send to you by Samsung to review, or you buy it used from a reviewer on eBay, lol...
     
  14. sppl thread starter macrumors newbie

    Joined:
    May 9, 2012
    #14
    @richnyc. I didn't know 3Gb meant SATA2 earlier which is why I posted the question :). I am now aware of that.

    I am not returning this back and have decided to keep it since its much faster than my old HDD. Thanks for the advice about TRIM. I will keep it ON.
     
  15. richnyc macrumors regular

    richnyc

    Joined:
    Nov 8, 2012
    Location:
    NYC
    #15
    Congrats;) AFAIK, if you keep TRIM on for your SSD, it won't slow down over time, even if only marginally.

    Now, I don't ever see myself getting used to HDDs inside laptops... lol
     
  16. jsssi macrumors newbie

    Joined:
    Mar 6, 2014
    #16
    Very low SSD speeds


    Hi,

    I have changed also a 120GB SSD to my MacBookPro5,1 and it is running very low compared to your speeds testing with BlackMagic Disk Speedtest:

    WRITE = 66 MB/s
    READ = 70MB/s

    This SSD is taken from another newer MacBookPro that I upgraded for a bigger SSD. This means that the 120GB SSD that I now have on my MacBookPro5,1 is Apple originated. Here are the specs (About this mac > More info > Serial-ATA):

    Vendor: NVidia
    Product: MCP79 AHCI
    Link Speed: 3 Gigabit
    Negotiated Link Speed: 3 Gigabit
    Description: AHCI Version 1.20 Supported

    APPLE SSD TS128C:

    Capacity: 121,33 GB (121*332*826*112 bytes)
    Model: APPLE SSD TS128C
    Revision: CJAA0201
    Serial Number: 42EB50MAK6KK
    Native Command Queuing: No
    Removable Media: No
    Detachable Drive: No
    BSD Name: disk0
    Medium Type: Solid State
    TRIM Support: Yes
    Partition Map Type: GPT (GUID Partition Table)
    S.M.A.R.T. status: Verified
    Volumes:
    Capacity: 209,7 MB (209*715*200 bytes)
    Writable: Yes
    BSD Name: disk0s1
    Macintosh HD:
    Capacity: 120,99 GB (120*988*852*224 bytes)
    Available: 6,49 GB (6*490*742*784 bytes)
    Writable: Yes
    File System: Journaled HFS+
    BSD Name: disk0s2
    Mount Point: /


    What could be the reason for it running so low? It seems the trim is also enabled?
     
  17. OldMacUser macrumors member

    OldMacUser

    Joined:
    Jan 10, 2011
    Location:
    Melbourne, Australia
    #17
    Could be the read/write tests are not "optimised" as there is very little free space on the disk.

    Depending on the options on the BlackMagic Speed Test, it will write a 5GB file to the disk and read from it.
     
  18. yjchua95 macrumors 604

    Joined:
    Apr 23, 2011
    Location:
    GVA, KUL, MEL (current), ZQN
    #18
    The speeds are perfectly normal, because the SSD is already saturating the SATA2 connection in your MBP. Your MBP can only support 3Gbps, so 250MB/s is perfectly normal.
     

Share This Page