SSD upgrade, not getting results I should be?

Discussion in 'iMac' started by tonyy, Dec 5, 2012.

  1. macrumors 6502a

    tonyy

    Joined:
    Oct 8, 2011
    Location:
    Dallas
    #1
    Just did the SSD upgrade on my late 09 imac. I replaced the original HDD with a Samsung 830.

    Process took me about 1 hour from start to finish. It's actually not that hard at all.

    My boot time went from 45 seconds down to 15 or so. Apps load up quickly and overall responsiveness is a lot better.

    However, I did a read/write test with BlackMagic and the results left me pretty disappointed. I know the SSD is working and all but these results are slower than Sata I speeds!

    Specs are: 21.5" iMac, 3.06 GHz, 12GB ram.
     

    Attached Files:

  2. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #2
    Go to Applications / Utilities / System Profiler (System Report) > Hardware > Serial ATA > your SSD > Negotiated Link Speed and tell us what it says there.

    You can also use these applications to benchmark the speed of your SSD, to see, if it is the culprit:
     
  3. thread starter macrumors 6502a

    tonyy

    Joined:
    Oct 8, 2011
    Location:
    Dallas
    #3
    Excellent. Thanks, I will report back this evening when I can test it out again.
     
  4. macrumors regular

    Joined:
    Mar 12, 2008
    #4
    Your read/write speeds can't be correct - performance indicates that your new drive is running fine.

    Are you sure you haven't accidentally tested another (slower) attached drive?

    There is no other drive-intensive process/app running while you did the test?

    You could try a different software to check drive performance:
    http://www.aja.com/en/products/software/
     
  5. thread starter macrumors 6502a

    tonyy

    Joined:
    Oct 8, 2011
    Location:
    Dallas
    #5
    I agree. I replaced the HDD so there is no other drive for it to test.

    No applications or processes were running at the time either. Is there a way I can check to see what it is testing exactly?

    In going to try the other software links you guys provided later this evening.
     
  6. hfg, Dec 5, 2012
    Last edited: Dec 5, 2012

    hfg
    macrumors 68030

    hfg

    Joined:
    Dec 1, 2006
    Location:
    Cedar Rapids, IA. USA
    #6
    What brand of SSD did you buy (whoops, I see you have a Samsung)? Different disk tests will show different results as a result of the testing methodology.

    For example, SSDs with SandForce controllers such as OWC and others, compress data as written. They will appear to be slow using BlackMagicDesign "DiskSpeedTest" which uses large blocks of un-compressable data for testing. These drives will test much better with the AJA disk test program.

    If it actually "feels" slow, regardless of what testing shows, then you probably do have a problem somewhere. Your disk test results do appear to be slow, however, for a Samsung 830..
     
  7. thread starter macrumors 6502a

    tonyy

    Joined:
    Oct 8, 2011
    Location:
    Dallas
    #7
    I'm trying not to get too caught up in the numbers. My boot time is about 15 seconds now and apps load up almost instantaneously and everything is very responsive overall.

    I'm just hoping its the testing software issue and perhaps a different program will give me the actual results.
     
  8. macrumors regular

    Joined:
    Oct 17, 2011
    #8
    What are you saying in regards to the Samsung 830? I have seen good reviews for that drive, is that not the case?
     
  9. macrumors 6502

    Joined:
    Feb 27, 2010
    #9
    Check the negotiated link speeds and see if its listed as 1.5, 3 or 6 (Gb/s). I don't think the 2009's were using SATAIII speeds, so you may see only 3Gbs as the max.
     
  10. hfg
    macrumors 68030

    hfg

    Joined:
    Dec 1, 2006
    Location:
    Cedar Rapids, IA. USA
    #10
    No, I said his test numbers seem to be a bit slower than others have seen with the Samsung 830 drive. The Samsung 830 is a great drive.
     
  11. macrumors 6502

    Joined:
    Jul 30, 2010
    #11
    I replaced my 2010 iMac drive with a SSD (Kingston Hyper 3x) a couple days ago. Black Magic shows an increase from ~ 125 mb/s on the 1 TB platter disk to 245 mb/s which is in the ballpark for realistic channel performance for a sata II controller (probably a true max of 275 mb/s on sata II) on the iMac.
     
  12. hfg
    macrumors 68030

    hfg

    Joined:
    Dec 1, 2006
    Location:
    Cedar Rapids, IA. USA
    #12
    I am thinking that a 2009 probably does have SATA-II interfaces which would limit the speed. However, I found some DiskSpeedTest results from my Mac Pro (also SATA-II) which are double (204/263) what he is seeing. I think the SSD I was testing at that time was a Crucial M4 in the standard Mac Pro disk tray.
     

    Attached Files:

  13. thread starter macrumors 6502a

    tonyy

    Joined:
    Oct 8, 2011
    Location:
    Dallas
    #13
    Yep, I was expecting between 200-300 mb/s. 107 mb/s seems WAY too low for Sata II speeds.
     
  14. macrumors 6502

    Joined:
    Feb 27, 2010
    #14
    If it helps, I'm running a Crucial M4 128GB in a Seagate Thunderbolt sled (STAE121). My speeds are actually right around 300MB/s read and around 150-175MB/s read. Its connected at 6Gb/s.

    Also, I saw online people confirming that the 2009 iMac is only SATAII.
     
  15. thread starter macrumors 6502a

    tonyy

    Joined:
    Oct 8, 2011
    Location:
    Dallas
    #15
    Yah, I saw that as well and totally fine with Sata II speeds. At 3 GB/s, that is a lot faster than what I'm getting now.

    Once I check and confirm link speed, what if its 1.5 and not the suggested 3? Is that firmware related then?
     
  16. macrumors 6502

    Joined:
    Feb 27, 2010
    #16
    You know, I'm not really sure if firmware would help here. My hope is that you are running SATAII; as you can see from my scores even at SATAIII I still seem to be running sort of slow for what the drive can do. I'm hoping its more of this Seagate sled, but I've actually had this running in a Lacie Little Big Disk Thunderbolt until last night, and that enclosure only does SATAII and the speeds were closer to 220 read/120 write.

    I've got a Sammy 256GB 830 coming in over the next few days. I'll test that out with the same hardware I have now and see how it stacks up to the Crucial for speeds.
     
  17. macrumors 68020

    Joined:
    Apr 26, 2003
    Location:
    California
    #17
    No - I believe it would be related to the chipset supporting the bus.
     
  18. macrumors newbie

    Joined:
    Oct 24, 2012
    #18
    Maybe a pram-resett and smc-resett could help.
    http://support.apple.com/kb/HT1379

    Shut down your Mac.
    Locate the following keys on the keyboard: Command (⌘), Option (alt), P, and R. You will need to hold these keys down simultaneously in step 4.
    Turn on the computer.
    Press and hold the Command-alt-P-R keys before the gray screen appears.
    Hold the keys down until the computer restarts and you hear the startup sound for the second time.
    Release the keys.

    and smc resett
    http://support.apple.com/kb/HT3964
     
  19. macrumors regular

    Joined:
    Jun 13, 2012
    #19
    Has spotlight finished indexing?
     
  20. macrumors member

    EPiCDiNGO

    Joined:
    Sep 10, 2012
    #20
    I have a mid 2010 Macbook Pro and i upgraded the HDD to a Samsung 830 256 SSD I just did a test now and the speed seems better than your speed but not as good as I expected but like you boot times and apps opening is super fast so no complaints here. :apple:
    [​IMG]
     
  21. macrumors member

    Joined:
    Apr 2, 2009
    #21
    After replacing the Hard Drive with a SSD you ALWAYS should do a PRAM Reset.
    I do it on all units, when i raplace the Hard Drive exactly for that reason.
     
  22. macrumors regular

    iLondoner

    #22
    I have a mid-2011 1.7GHz MacBook Air with Apple's standard 256GB SSD and I get similar sort of results to EPiCDiNGO.
     
  23. macrumors 6502

    Joined:
    Aug 14, 2007
    #23
    I don't agree. The elimination of seek times results in a huge performance improvement even when there is a problem. The very early SSDs had a slower peak MB/s than mechanical hdds, and while being much slower at sequential tasks, and speedtests such as the software used here, they still thrashed hard disks in random access tasks.

    Even with your reduced speed, 99% of the time you probably won't notice the problem. That said, it's still worth trying to fix somehow. Try copying a large file and see what speed you get in actual real use.

    Did you change any cables?
     
  24. thread starter macrumors 6502a

    tonyy

    Joined:
    Oct 8, 2011
    Location:
    Dallas
    #24
    I just checked: my negotiated link speed is 1.5

    The link speed is 3.

    I did a pram and smc reset and still the same. WTF.

    ----------

    I didn't change any cables. I used the original SATA cable from the HDD and plugged it into the SSD. I'm only getting 1.5 negotiated link speed.

    ----------

    Yep. There is no dot in the middle suggesting that it's indexing.

    ----------

    Yup, just followed your advice and did a reset. Still no luck.
     
  25. hfg
    macrumors 68030

    hfg

    Joined:
    Dec 1, 2006
    Location:
    Cedar Rapids, IA. USA
    #25
    Wow ... sounds like you may have found your problem ... but why?

    Was your SSD purchased new, packaged, from a reliable dealer, or from eBay?

    I haven't heard of any cases of counterfeit SSD drives (lots of flash counterfeits running around).

    You might see about returning it for a replacement. :(
     

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