Best RAM Setup for iMac

Discussion in 'iMac' started by AppleDev879, Sep 11, 2011.

  1. AppleDev879 macrumors newbie

    Mar 1, 2011
    I have a Late 2009 iMac (4 RAM slots, 2 with 2GB each). I'd like to upgrade to 8 GB. Is it ok to just put one 4 GB module in one of the two remaining slots, leaving the last slot empty? I've heard this reduces performance slightly, but I'd like the last slot open in case I want to install more memory later. Would this really reduce the performance of the memory?

    I've been looking at purchasing the memory from Crucial (see below):

    Any help greatly appreciated. Thanks.
  2. GGJstudios macrumors Westmere


    May 16, 2008
  3. alust2013 macrumors 601


    Feb 6, 2010
    On the fence
    That would work fine. The performance hit is so incredibly small that it is unnoticeable, and more memory would be better than faster anyhow. Given that it's so cheap, you could easily go for 12GB by getting 2x4GB to add if you like.
  4. iSayuSay macrumors 68040


    Feb 6, 2011
    I'd go with 2x4GB to fill up iMac RAM slot. I know what your plan is. You want to leave an empty slot to upgrade further when higher capacity RAM (i.e 8GB) comes in one piece, right?

    Well that future is not really nearby. Maybe you have to wait a year from now before 8GB chips become cheap and common. And by the time that come, you already have money to buy another 2x8GB RAM, or even replace your iMac.

    So... why not enjoying full capacity of RAM now? And upgrades the whole RAM later?
  5. JonasDK macrumors member

    Aug 18, 2011
    +1. RAM is so cheap anyway, there is really no reason not to just fill up those RAM slots.

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