Late 2009 27" iMac SSD Speed Test

Discussion in 'iMac' started by eddjedi, Jul 23, 2012.

  1. eddjedi macrumors 6502

    Sep 7, 2011
    I've just put a 256GB SSD in place of the optical drive in my 2009 iMac. I'm impressed at how much better it performs and feels, it boots far quicker and there's noticeably less lag when opening apps and files. Copying large files is significantly faster. However I just ran a speed test with BlackMagic and am somewhat disappointed with the test results (see attachment.)

    My stock 1TB internal HD gets read and write scores of about 100MB/s so the read and write of the SSD drive (especially read) are significantly quicker, so the upgrade certainly wasn't a waste of time. But they're nowhere near the 300MB/s+ the SSD is supposed to achieve.

    So I was just wondering if this is to be expected. I realise that the optical drive connection is only SATA II, could this be to blame? Are manufacturer read/write speeds always so optimistic, or is the drive possibly faulty?

    I'd be interested to know if anyone that's done the same upgrade could share their test results. Thanks.

    Attached Files:

  2. eddjedi thread starter macrumors 6502

    Sep 7, 2011
    I've just done a little digging and am slightly concerned after seeing this post:

    They're using the same test app as I am. One guy is getting speeds near to my SSD from his 7200rpm HDD! I realise the conditions are different, but surely my SSD shouldn't be so slow?
  3. WesCole macrumors 6502a

    Jul 1, 2010
    What brand/model of SSD do you have? Your speeds are much faster than my 1TB 7200 RPM drive in my 2011 iMac.
  4. eddjedi thread starter macrumors 6502

    Sep 7, 2011
    Thanks for the reply. I have a Lite-On 256GB SSD. Spec here:

    As you can see, should be getting well over double the read/write speed I am. It's not terrible or anything, significantly quicker than my HDD so performance is improved, but it's just not as fast as I was expecting so ideally would like to see what kind of speeds other people who have done the optical bay upgrade are getting.
  5. eddjedi thread starter macrumors 6502

    Sep 7, 2011
    Here are 2 more screenshots - the first is my internal 1TB HD, and the second is the built in SSD in my 2010 MacBook Air. In my opinion based on the claims of the drive manufacturer, the SSD I have put in my iMac should be significantly faster than both. Unless somebody can chime in and tell me it's just due to the optical drive SATA connection. Can anybody help?

    Attached Files:

  6. eddjedi thread starter macrumors 6502

    Sep 7, 2011
    I found this thread with a good suggestion:

    Both my stock 1TB HD and the new SSD in the optical bay are reporting SATA 3GBPS (both link speed and negotiated.) I also installed TRIM enabler, no difference either.

    So bearing in mind my iMac seems to have no problems with the SATA connections, is it possible the drive is faulty? Or is a 40% reduction in speed due to my iMac being SATA 3GBPS rather than 6GBPS likely?
  7. JasperNL macrumors member

    May 18, 2012
    I have similar results with my SSD drive on my iMac 2011. The SSD drive was installed by Apple (BTO). Was a little disappointed about the results too.
  8. mactmaster macrumors 6502

    Jun 16, 2010
    It's 3Gbps meaning around 300 MBps max bandwith but in real world usage the throughput is close to what you are seeing. This drive would likely be faster on a system with 6Gbps SATAIII.

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