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    3gb Ram - T400

    Discussion in 'Lenovo' started by plancy, Oct 13, 2008.

  1. plancy

    plancy Notebook Evangelist

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    I've been reading about RAM and I found out that if 2 modules are not the same size, they will run in single channel mode. Has lenovo fixed this... since they are offering 3GB on 2 DIMMS?
     
    plancy, Oct 13, 2008
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  2. Kenji

    Kenji Guest

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    2 Modules that are not identical in size will not run in dual channel mode. Get 4GB, even if you are using a 32 bit OS it will run in dual channel.


    EDIT: I was wrong, See Andy's post.
     
    Kenji, Oct 13, 2008
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  3. plancy

    plancy Notebook Evangelist

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    OMG i need to call Lenovo then ! those asses........ why are they offering 3 GB!!!
     
    plancy, Oct 13, 2008
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  4. StealthTH

    StealthTH Notebook Evangelist

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    Difference in performance is minimal. Plus, if I am getting 3GB, I would rather just replace the 1GB stick someday than replace both sticks. Just my opinion.
     
    StealthTH, Oct 13, 2008
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  5. Andy

    Andy Notebook Prophet

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    They will run in Dual Channel mode.

    2+2 --> Symmetric DC (23% boost in bandwidth)
    2+1 --> Asymmetric DC (20% boost in bandwidth)

    (Intel Flex Memory)

    Anyway, there is no noticeable affect on performance with DC....

    (Sym/Asym/No DC, you won't notice any affect on performance)
     
    Andy, Oct 13, 2008
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  6. plancy

    plancy Notebook Evangelist

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    Minimal? lol
     
    plancy, Oct 13, 2008
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  7. plancy

    plancy Notebook Evangelist

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    wow, well anyways.. if im comparing to my current system which is 400MHz DDR, im sure the DDR3 1066MHZ more than make up for the 3% speed loss.
     
    plancy, Oct 13, 2008
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  8. Andy

    Andy Notebook Prophet

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    DDR3-800/DDR3-1066....Not a noticeable difference in performance.

    If you have 3GB DDR3-800, no need to upgrade....
     
    Andy, Oct 13, 2008
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  9. Kenji

    Kenji Guest

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    Wow, I never knew that. You learn something new everyday, as they say.
     
    Kenji, Oct 13, 2008
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  10. plancy

    plancy Notebook Evangelist

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    Assuming he knows first hand what he's saying, but he sounds knowledgeable.
     
    plancy, Oct 13, 2008
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  11. Lew

    Lew Notebook Deity

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    This thread is a great example of why it is important to qualify that what you've read actually is still valid in the face of new technology and new chipsets.
     
    Lew, Oct 13, 2008
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  12. Andy

    Andy Notebook Prophet

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    Dual Channel Ram guide

    You can confirm Dual Channel functionality using CPUz/Sandra 2009/PC Wizard/Everest Ultimate....
    I am not sure about the compatiblity of the above tools with the fairly new GM/PM45 GMCHs, so have a look at the GM45 datasheet, and I think you may come across Intel Flex Memory.
     
    Andy, Oct 13, 2008
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  13. plancy

    plancy Notebook Evangelist

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    GREAT, didn't really consider that.
     
    plancy, Oct 13, 2008
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  14. plancy

    plancy Notebook Evangelist

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    Thanks Andy.
     
    plancy, Oct 13, 2008
    #14