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Overloading RAM on my iMac

5794 Views 25 Replies Latest reply: Feb 17, 2013 4:22 AM by Raystrack RSS
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Jeff Mark Level 1 Level 1 (5 points)
Currently Being Moderated
Aug 28, 2012 2:36 PM

Hello...

 

Please see here for reference. Apparently I am able to load two 2GB modules in my MacBook despite the original specs, which said 2GB total max.

 

So, can I do similarly on my '08 iMac, currently maxed out at 4GB? I.e., cram two 4GB modules into it? If it turns out the system can only address 6GB-7GB of that (as with the MacBook), that's OK. Turns out Mt. Lion is heavier lifting than this thing's used to. (I've considered a drive upgrade but that would require professional help. RAM I can do myself.)

 

Processor  2.8 GHz Intel Core 2 Duo

 

Memory  4 GB 800 MHz DDR2 SDRAM

 

On the other hand, I did some looking around and it would appear that DDR2 PC2-6400 is not available larger than 2GB. Would some other format do as well?

 

Thanx muchly,

 

Jeff

 

P.S., I eagerly await the next release of iMacs, whenever that might actually happen...

iMac (24-inch Early 2008), OS X Mountain Lion
  • RRFS Level 5 Level 5 (4,425 points)
    Currently Being Moderated
    Aug 28, 2012 2:36 PM (in response to Jeff Mark)

    go to Crucial or OWC they will recommend the proper amount of RAM for your system. I have 6GB in my one 2GB and one 4GB, works great. Be careful as Macs are very particular about their RAM, even some that meet specs won't work properly.

  • MichelPM Level 5 Level 5 (7,105 points)
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    Aug 28, 2012 2:38 PM (in response to Jeff Mark)

    The max RAM you can install into your iMac is 6 GBs.

    No more than this.

     

    Here's the specs for you RAM.

     

    6.0 GB (Actual) 4.0 GB (Apple)

    Memory Slots     2 - 200-pin PC2-6400 (800MHz) DDR2 SO-DIMM

     

    You can buy reliable RAM online from Crucial memory or OWC.

  • RRFS Level 5 Level 5 (4,425 points)
    Currently Being Moderated
    Aug 28, 2012 2:40 PM (in response to Jeff Mark)

    No, because they want their guaranteed products to work properly.

  • MichelPM Level 5 Level 5 (7,105 points)
    Currently Being Moderated
    Aug 28, 2012 2:42 PM (in response to Jeff Mark)

    No.

    Your iMac is not capable of addressing more RAM than the 6 GB limit.

    Sorry.

  • RRFS Level 5 Level 5 (4,425 points)
    Currently Being Moderated
    Aug 28, 2012 3:02 PM (in response to Jeff Mark)

    When I got my 6GB of RAM I tried putting the 4GB module in the fist slot, it was not recognized, so that would be a no to the 8GB question.

  • RRFS Level 5 Level 5 (4,425 points)
    Currently Being Moderated
    Aug 28, 2012 3:15 PM (in response to Jeff Mark)

    It gave me 3 beeps and refused to start. I'm not sure if the "pair" of modules I got from Crucial is matched somehow or maybe it's tested by them to know it works together. I only know it was at least the same specs just 4GB instead of 2GB.

  • MichelPM Level 5 Level 5 (7,105 points)
    Currently Being Moderated
    Aug 28, 2012 3:33 PM (in response to Jeff Mark)

    Yes, when applicable, it's always better to install RAM into an iMac in pairs.

    But for the iMsc models that take the 6 GBs of RAM, putting (2) 4 GB RAM pairs does not work in these Macs.

    I believe it's OWC that tests how much max RAM can be installed in Macs.

    Not all Mac models can exceed Apple's stated max. RAM amounts.

    Those that do exceed Apple's stated amount can vary widely in their amount of max. RAM.

    For the 2008 models the only combination that was found to work is to install a 2 GB, than a 4 GB stick into these Macs for a total of 6 GBs.

  • MichelPM Level 5 Level 5 (7,105 points)
    Currently Being Moderated
    Aug 28, 2012 3:35 PM (in response to Jeff Mark)

    Yes, That would be the correct order for the RAM.

  • RRFS Level 5 Level 5 (4,425 points)
    Currently Being Moderated
    Aug 28, 2012 3:54 PM (in response to Jeff Mark)

    Doubt it would work. I wouldn't take the chance of it damaging some other component like the motherboard if it has a different pin configuration (for some inexplicable reason).

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