Help needed for RAM choice. [SOLVED]

Discussion in 'Buying Tips and Advice' started by LostSoul80, May 25, 2010.

  1. LostSoul80 macrumors 68020


    Jan 25, 2009
    Hi everybody,
    I have to update an iMac. It's pretty old (relatively - late 2006), and i'm in doubt on which RAM should I buy.
    From the System Profiler, I can see it's an iMac5,1, which is using 2x512MB of DDR2 RAM 667 mhz.
    I've seen this Kit 3 GB (2+1 GB) SODDR 2 667 for iMac Intel, but it says SODDR, not DDR! Is that a problem?

    Thanks in advance
  2. CanadaRAM macrumors G5


    Oct 11, 2004
    On the Left Coast - Victoria BC Canada
    The iMac5,1 can take 2 x 2 GB DDR2-667 SODIMMs however OSX will only recognize 3 GB of the total (it's a hardware limitation of the motherboard)

    There is a small advantage to putting in 4 GB, because you'll get a 6% - 8% speed increase overall vs. putting in a 1 GB + a 2 GB. This is because a matched pair (2 GB + 2 GB) can do Dual Channel memory access.

    You have a slight confusion in the terms. Here's the breakdown.

    DDR2 is the type of RAM (Double Data Rate 2)
    667 is the speed of the RAM in MegaHertz
    DDR2-667 is also referred to as PC2-5300 (5300 being the nominal data throughput in Mb/s - 667 MHz x 8 bits)
    SODIMM is the module format it comes in (Small Outline Dual Inline Memory Module)
  3. LostSoul80 thread starter macrumors 68020


    Jan 25, 2009
    Thank you for the link.

    I agree with you, I'm quite confused about RAM terms and such. Thank you for the explanation. BTW "PC2-5300" is reported also in the site I was looking, so I'll go for 2x2gb.
    Thank you again :)

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