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SODIMM 100Mhz 133Mhz HD LD

Discussion in 'Laptops' started by techie_alison, Oct 28, 2005.

  1. Hi, hope you can help out here :)

    Machine: Dell Inspiron 5000e PIII-800
    Recommended RAM: SODIMM 100Mhz Low Density (16 chips)
    Maximum RAM: 2off 256Mb = 512Mb

    I'd like to max out this machine to 512Mb and would like to use 133Mhz
    modules, as naturally they're cheaper than the rarer 100Mhz ones.

    This is confused in that occasionally 133Mhz modules are sold as being
    66/100/133 compatiable.

    This is also confused as the word on the street is that the Dell 5000/5000e
    requires Low Density modules, as in 16chips.

    First off, I have two 128Mbyte 100Mhz 4-chip (high density) modules in the
    machine at present. That kind of blows out the high/low density theory??

    Any takers?

    Thanks kindly,

    techie_alison, Oct 28, 2005
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  2. Re: "I have two 128Mbyte 100Mhz 4-chip (high density) modules in the
    machine at present. That kind of blows out the high/low density theory?"

    No, not at all. Think about it; 512 MB is 4x 128MB. So you are looking
    for 512MB using 16 chips, or 8 chips per 256MB. That's what you'v got,
    you've got low density modules.
    Barry Watzman, Oct 29, 2005
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  3. techie_alison

    techie_a Guest


    Now I'm totally confused.

    It's saying here that my current 256Mb should be 16*128Mbit, thus implying
    that my modules should have 8 chips on them.

    With my 512Mb aims I'm heading for 32*128 or 64x64 overall.

    Time to get out the magnifying glass me thinx..


    (but thanks, please carry on) :)
    techie_a, Oct 29, 2005
  4. I think what's making this confusing is that a fair number of sellers just
    say 256Mb PC100/133 SODIMM 144pin and leave it at that, boom!! There's also
    varying methods of identifying the chip composition when they do list the
    specifics. Some will refer to the modules in Mbits, which others will make
    references in Mbytes. Also confusing is that chips can be addressed in
    different ways depending on how the board is wired up. So you could
    technically have a board with 512Mbit chips on it, which is wired up so the
    computer sees 64Mbit chips.

    32Mbyte * 64

    That says to me 32Mbytes * 64 = 2048Mbytes. But then if you take the
    initative and divide by 8, we reach 256Mbytes. So it makes me wonder if
    that 32Mbyte flag is actually 32Mbit. Or even 32 * 64Mbit seeing as I'm
    starting to question their understanding of what they're selling. The peeps
    in these PC World centres etc. neither know nor care.

    High density chips are 512Mbit, 256Mbit. Low density chips are 128Mbit,
    64Mbit. Sooooo

    HD 512Mb with 512Mbit chips = 64Mbytes per chip = 2 chips (64Mbytes * 2)
    (512Mbits * 2)
    HD 256Mb with 512Mbit chips = 64Mbytes per chip = 4 chips (64x4) (512 * 4)
    HD 512Mb with 512Mbit chips = 64Mbytes per chip = 8 chips (64x8) (512 * 8)

    HD 128Mb with 256Mbit chips = 32Mbytes per chip = 4 chips (32x4) (256x4)
    HD 256Mb with 256Mbit chips = 32Mbytes per chip = 8 chips (32x8) (256x8)
    HD 512Mb with 256Mbit chips = 32Mbytes per chip = 16 chips (32x16) (256x16)

    LD 128Mb with 128Mbit chips = 16Mbytes per chip = 8 chips (16x8) (128x8)
    LD 256Mb with 128Mbit chips = 16Mbytes per chip = 16 chips (16x16) (128x16)
    LD 512Mb with 128Mbit chips = 16Mbytes per chip = 32 chips (16x32) (128x32)

    LD 128Mb with 64Mbit chips = 8Mbytes per chip = 16 chips (8x16) (64x16)
    LD 256Mb with 64Mbit chips = 8Mbytes per chip = 32 chips (8x32) (64x32)
    LD 512Mb with 64Mbit chips = 8Mbytes per chip = 64 chips (8x64) (64x64)

    Also... These 64x32 numbers etc. are swapped around, depending on which
    manufacturer you check.


    In the link above, 256Mb is described as 32Meg x 64, which I bet is 32chips
    x 64Mbit ICs.


    Kingston don't even tell you what sort of modules you're buying. So you
    can't even double check on the numbers.

    I'm searching here for links to back up these therories yet am just finding
    256Mb PC133 SODIMMs, boom!!


    There's another one, tells me nothing. I bet there's 8 chips on there
    though, 4 on each side. Sooo. 256 / 8 = 32Mbyte chips (8x32). Low density?
    If there's 4 chips on the whole board; 256 / 4 = 64Mbyte chips. (8x64).
    Based on the table up above let's swap round to get (64x8). 64Mbyte chips
    are 512Mbit. 32Mbyte chips are 256Mbit. Either way, those are high density
    boards!!?? Answer is, we don't! Without those composition numbers spelling
    out the arrangement.


    There's another one but this time it has the configuration on it, same
    boards too.

    32 Meg x 64. I guess that's 32Mbits x 64 chip layout. 32*64 = 2048 / 8 =


    Another search on Crucial for a Dell Inspiron 8100 listed as compatiable.
    Same configuration as the previous crucial link. 32Meg x 64. Bits? or
    Bytes? 32*64=2048. /8 = 256Mbytes. 32Mbit chips!! 64 of 'em! or 64Mbit
    chips, 32 of them!


    I'm determined to get my head around this by working through it. Speed I
    don't think to be too much of a factor, as long as the CAS latency is
    matched. Module composition though?? Bits or Bytes??

    I wouldn't be at all surprised is manufacters start telling customers that
    the computer they're about to buy has 4096Mbits of RAM in it. Just to make
    the numbers bigger.

    Hopefully taking the Inspiron 5000 to a guy who bulk sells on eBay and lives
    near me who'll plop some sticks in based on cash-in-hand.
    techie_alison, Oct 29, 2005
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