Precision M6400 Owner's Lounge *Part 2*

Discussion in 'Dell Latitude, Vostro, and Precision' started by BatBoy, Oct 14, 2009.

  1. DynamiteZerg

    DynamiteZerg Notebook Evangelist

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    The M6800 is using "Kingston HyperX 2133MHz, HX321LS11IB2K2/16, (4 x 8GB)".

    The M6500 is using "Crucial Technology, BLS8G3N169ES4, 16FE (4 x 8GB)".
     
  2. remdale

    remdale Notebook Consultant

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    Thanks. But this information printed on stickers is not really helpful. Could you please check what's printed on the chips themselves?
     
  3. DynamiteZerg

    DynamiteZerg Notebook Evangelist

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    Sorry mate, I'm too lazy to take them out and have a look.

    I'll have a look when i get the chance.
     
  4. remdale

    remdale Notebook Consultant

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    Ok, be careful to not damage the chips
     
  5. DynamiteZerg

    DynamiteZerg Notebook Evangelist

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    You are in luck. One of my HDD in the M6500 died on me. So I'm replacing it with a HDD from the M6800 and in turn replacing that HDD with a new SSHD.

    I will let u know what's printed on the chips, in the M6500 & M6800, itself later on.
     
  6. remdale

    remdale Notebook Consultant

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    Awesome! Sorry for your loss...
     
  7. DynamiteZerg

    DynamiteZerg Notebook Evangelist

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    The chips on the Kingston HyperX has the following printed on it:

    SK hynix
    H5TC4G838FA
    RDA 546V
    DWMAK909SH or DWMAL031H1 (There's a few different markings for this on the chips)

    The chips on the Crucial, on the other hand, has a big print BX across it and V10X or V105 on one top corner. Nothing more.

    I can upload the pictures I took of them if you want. However, you will find the same info as above.
     
  8. remdale

    remdale Notebook Consultant

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    Maybe H5TC4G83BFA?
    Thanks. Now let me clarify the issue. 8GB modules use sixteen 4Gbit RAM chips that use address lines from A0 up to A15. The A15 pin is not just an address pin. It is responsible for initialization commands during boot up as well. When you inserted your RAM, M6400 couldn't initialize it because A15 is a part of the MR1 register and is not connected in M6400
    upload_2019-5-21_19-4-55.png



    The difference between the SO-DIMM interfaces of M6400 and M6500 is that the A15 pin is not connected in the first case, whereas it is connected to the CPU socket in M6500.
    Now, here is a table of addressing for 4Gbit chips.
    upload_2019-5-21_18-40-17.png
    As you can see, there are 3 types of RAM chips with x4, x8 and x16 bit data interfaces. A typical RAM use 8bit chips. Yours are 8bit as well (as they are 16 in total). According to the table, they use the A15 pin. But there are x16 chips (the last column) which don't use A15 and the last pin used is A14 which would be a good option for us. But now it comes down to the memory controller itself.
    According to the datasheet:
    The memory controller has 2 channels that support up to two RAM sticks each. A DDR3 module has a 64-bit interface. If we use 16-bit chips to build up a rank, we would need 4 chips to build up a 64-bit rank. But we can use up to 2 ranks for each RAM stick, thus it will have 8x16-bit chips (4 chips on each side). But in this case we will have just 4GB of RAM instead of 8. Using 8-bit chips to increase the amount of RAM (number of chips) for each module would do the job, but not in case of M6400.
    Having researched this info, I can now understand why it's not possible for us to use more that 16GB of RAM.
     
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  9. DynamiteZerg

    DynamiteZerg Notebook Evangelist

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    Could be a B. The laser writing is a bit off.
     
  10. remdale

    remdale Notebook Consultant

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    Sorry, I cannot get your idea. What do you mean?
     
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