G4 AGP not recognizing 512MB ram module

Discussion in 'Mac Basics and Help' started by itsmrblonde, Feb 3, 2006.

  1. itsmrblonde macrumors newbie

    Feb 3, 2006

    I just bought a 512mb memory module for my G4 which was already running 576 ram (two of 256 and one 64). I decided to add the 512 since i just installed Tiger and i want things to be smoother.

    I bought the right type of memory...168-pin pc100 but the problem now is that it doesnt recognize it, it doesnt post...whatever the jargon is. I've been told and keep seeing online over and over that the BUS has to be be 3X, that then and only then will the system recognize a 2GB memory limit.

    But I have no idea how to make my bus 3x.

    I do know that my current bus speed is 100mhz.
    I suppose some meddling will have to be done with the firmware?
    I just updated it successfully to the latest version (4.2.8f1), by the way, thinking that that would solve the problem...but the 512 is in and its still not being used by the computer.

    PLEASE HELP! i was scammed for a $335 lacie external hard drive on ebay recently and i really dont feel like accepting my defeat so early on with this purchase....

    You are welcome to doctor my frustration.

  2. andy89 macrumors 6502

    May 22, 2005
    Folkestone, England
  3. SmurfBoxMasta macrumors 65816


    Nov 24, 2005
    I'm only really here at night.
    Been there, done that, last month with a newly aquired Sawtooth, and this is what I learned:

    Yes, 168pin + PC100 are partially correct specs. But most importantly for the older G4's (especially the Sawtooths), you MUST have low-density ram, which means 8- 32mb chips on each side of the module. Anything higher and the system will NOT recognize it........

    And btw, that bullysocky about the bus is just that.....B S
    My Sawtooth now runs supersweet with 2GB, now that I have the correct modules in it :)

    Also, if your ebay seller mis-represented the ram as being compatible w/macs, then you would be within your rights to demand a correct replacement or a refund. Or you could just re-sell it yourself and buy the right type.....

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