is PC2-5300 memory backward compatible with Pc2-4200 for dell 640M?

Discussion in 'Dell' started by lisa, Feb 3, 2007.

  1. lisa

    lisa Guest

    just bought the laptop with 1 gb memory but may need to ugrade to 2 gb
    when vista kit arrives. pc2-5300 seemed to be cheaper, will my 640M
    accept higher speed memory? TIA
    lisa, Feb 3, 2007
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  2. according to the 640m accepts two memory modules of up to 2gb
    each of either pc2-4200 or pc2-5300.
    your computer supports dual channel memory access so there is some
    performance gain if they are identical size/speed modules, but you can have
    modules of different sizes in the system. the 2gb modules are very
    expensive ($500 each) so you may have to get two 1gb modules ($100 each) if
    you want to upgrade.
    i can't find the 640m on dell's support site... not under inspiron, not
    under xps/inspiron... anyone know where it is??
    Christopher Muto, Feb 3, 2007
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  3. lisa

    WSZsr Guest

  4. ahh, under inspiron it is way down at the bottom of the model listing as
    "e1405/640m". thanks for pointing that out.
    Christopher Muto, Feb 3, 2007
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