Powerbook g4 1.5ghz RAM problem

Discussion in 'PowerPC Macs' started by Tybaltcap, Jul 19, 2008.

  1. Tybaltcap macrumors newbie

    Jul 19, 2008
    Hello gurus!

    I just got a new 1 gig ram chip to add to the second slot of my Powerbook g4 17 inch laptop. I already had a 512 chip in there so I thought that with my new addition I would have 1.5 gigs of RAM - but I noticed that now my computer only reports 1 gig. Any ideas why only half of my new ram is noticed? Is it not recognizing my old card?

    Thanks for any help you can give me!
  2. jjahshik32 macrumors 603

    Sep 4, 2006
    Uh oh... sounds like lower memory bank going out issue.. either that or your ram is not compatible?

    check this out:
  3. Tybaltcap thread starter macrumors newbie

    Jul 19, 2008
    hum - perhaps it is this problem - but it is recognizing some of my new memory! I have a 512 and a 1 gig chip. The 1 gig chip was put in the lower slot. Now I have 1 gig of reported ram - is it possible that there is a partial failure?

  4. CJRhoades macrumors 6502

    Dec 4, 2007
    Lafayette, IN
    I doubt that its only seeing half of your new RAM. It's more likely that its just not seeing your old RAM. Which RAM slot is the old one in. If it's the bottom one, then it sounds like that slot is faulty.
  5. Firefly2002 macrumors 65816

    Jan 9, 2008
    My guess is your new RAM uses high-density chips which it doesn't support, and so the PowerBook is only reading half of it.

    If I'm correct, the profiler should show two banks of 512 MB. If this is so, try returning your RAM, and buying a GB stick from OWC for your PowerBook.
  6. CanadaRAM macrumors G5


    Oct 11, 2004
    On the Left Coast - Victoria BC Canada

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