Macbook Early 2008 RAM upgrade (800mhz)

Discussion in 'MacBook' started by miknos, Mar 31, 2012.

  1. miknos Suspended


    Mar 14, 2008
    Took a month to receive a pair of Corsair DDR2 800Mhz.

    When I use both 800Mhz RAM, it doesn't boot. When I use one original (667Mhz), both RAM work at 667Mhz and I'm able to use 3GB of RAM.

    Is there any way to decrease the RAM speed to 667Mhz so I can use BOTH (4GB total) 800Mhz I bought?
  2. logana macrumors 65816


    Feb 4, 2006
    Not that I know of - MacBooks 3,1's and 4,1's like yours need at least one PC5300 ram chip in them to start up - the other ram can be PC5300, PC5400 or PC6400. If you put 2 PC6400 sodimms in it then all it will do is beep at you...

    You won't be able to use both - can you not send them back and get proper PC5300 sodimms ?
  3. miknos, Apr 1, 2012
    Last edited: Apr 1, 2012

    miknos thread starter Suspended


    Mar 14, 2008
    I'm afraid I'll have to find someone willing to exchange them around here.:(

    And what about performance. Is there any performance loss using 1x4GB instead of 2x2GB ?

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