Macbook pro 4GB ram upgrade problem! please help!!!

Discussion in 'MacBook Pro' started by rvdb, Mar 12, 2011.

  1. rvdb macrumors newbie

    Mar 11, 2011
    johannesburg, south africa
    My 15" macbook pro

    Model Name: MacBook Pro
    Model Identifier: MacBookPro4,1
    Processor Name: Intel Core 2 Duo
    Processor Speed: 2,4 GHz
    Number Of Processors: 1
    Total Number Of Cores: 2
    L2 Cache: 3 MB
    Memory: 3 GB
    Bus Speed: 800 MHz
    Boot ROM Version: MBP41.00C1.B00
    SMC Version (system): 1.27f3

    i needed to upgrade my memory as i use my mac for 3D work, so i checked and from what i could find my mac supports up to 4GB.

    the only prob was that i cant get 667mhz memory anymore (i live in S.A) so i bought a 2gb kingston kvr 800mhz stick and it worked perfectly (specs above with the new installed 800mhz ram). my mac downclocked it to 667mhz no problem. so i bought another 2Gb stick thinking that it would just do the same. however when i put it in i just get a blank screen at start up. (the new ram does work, i checked it by swopping it with the other 2gb kington ram and it works fine) i looked around and found that because i didnt have at least one of the original 667mhz sticks in, my mac wouldn't automatically downclock the 800mhz ram to 667mhz.

    is this correct?

    if so is there a way to manually downclock the ram?

    or is there ANY way at all to get around this?

    any help or suggestions are much appreciated!!!
  2. troels macrumors newbie

    Sep 26, 2009
    Copenhagen, Denmark

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