1gb of ram... but only 640mb ??

Discussion in 'General Mac Discussion' started by stevey500, Oct 12, 2004.

  1. macrumors 6502

    Sep 8, 2004
    Huntington, Utah
    Ok in my b/w rev. 2 450mhz I have 4 sticks of pc133 ram... 4 256mb cards... but when I go to see how much ram is has in "about this mac" it shows I have 640mb of ram... :rolleyes: \
    In system Profiler it shows
    DIMM0/J19 size 128
    DIMM1/J20 size 256
    DIMM2/J21 size 128
    DIMM3/J22 size 128

    All cards are ValueRAM brand PC133

    Does it matter if they are one or dule sided? Or what ?? hmm is there some kinda trick to this? Thanks!
  2. macrumors G5


    Oct 11, 2004
    On the Left Coast - Victoria BC Canada
    RE: 1gb of ram... but only 640mb ??

    Yep. On the blue and white you need 16-device DIMMs for 256 Mb.
    Kingston ValueRAM is quality PC generic memory but it is not designed for, or guaranteed compatible in Macs. They changed their chip configuration without changing their part number, so there is no way to know if you are getting 8 or 16 chip modules. Best bet is to sell the three on EBay or to PC owners and order from a seller who knows Macs.
  3. thread starter macrumors 6502

    Sep 8, 2004
    Huntington, Utah
    Hey thanks for the info :) I might just look into getting them on ebay... probly not that much worth selling the ones I have... But even with 640mb of ram I get the beach ball quite a bit ! But it is quite fast... Now I just need the g4 upgrade and ati 9200 :p

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