Limited speed on SATA (with SSD)

Discussion in 'iMac' started by yipchunyu, Apr 17, 2014.

  1. yipchunyu macrumors newbie

    Apr 17, 2014
    I search lots of sites and posts but still can't find the solution. Pls allow me to repost a common old question.

    I got an old iMac which is a late 2009 iMac (21.5 inch).
    I added some ram (total 8GB now) and replace the optical bay with a SSD drive (256GB Samsung 840 EVO).
    And then I form it as a fusion drive with the old hard disk (1TB 7200).

    So far so good expect that the negotiated link speed is always 1.5 Gigabit.
    I checked the web but I can't find a solution for this. Anyone did solve it in the past, please help to give me some insight to do so. Many thx in advance.

    Vendor: NVidia
    Product: MCP79 AHCI
    Link Speed: 3 Gigabit
    Negotiated Link Speed: 1.5 Gigabit
  2. photosmike, Apr 17, 2014
    Last edited: Apr 17, 2014

    photosmike macrumors member

    Mar 10, 2010
    Check Firmware

    Make sure you have the latest firmware

    My bad. Just noticed that there is not a firmware update for the late 2009 21.5" iMac.
  3. yipchunyu thread starter macrumors newbie

    Apr 17, 2014
    thx for your sharing. I accessed this page in the past. But late 2009 21.5 inch model is not on the list (but 27" is on the list). Still can upgrade?

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