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1.65v DDR3 Memory on 1.5v Board

Discussion in 'PC hardware help' started by k7vc, Sep 23, 2009.

  1. k7vc

    k7vc Regular member

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    I'm considering an Intel DP45SG mobo that calls for DDR3 memory at 1.5v, but it also says that higher voltage is optional for high-performance DIMMs.

    Can I just plug 1.65v DDR3 DIMMs into the board and will the board auto-configure for them or is there some BIOS or other change I have to make for the higher voltage?

    Will 1.65v DIMMs work if they are only given 1.5v?

    Newbie in Nevada,

    Dick
     
    Last edited: Sep 23, 2009
    k7vc, Sep 23, 2009
    #1
  2. dailun

    dailun Active member

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    My apologies to you. I did not thoroughly check my answer and couldn't find anything specific so I have withdrawn my post until I can verify the accuracy of the information.

    Intel's website did not address your question in specific terms, and only generally alluded to the fact that the memory voltage was adjustable in the BIOS.

    Sorry about that.
     
    Last edited: Sep 23, 2009
    dailun, Sep 23, 2009
    #2
  3. k7vc

    k7vc Regular member

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    I apologize, I will check first with each manufacturer's website. From your inference it appears to be adjustable with a BIOS setting. I have no aversion to RTFM if I can be pointed to the correct M.

    Thanks very much.

    Dick
     
    k7vc, Sep 23, 2009
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  4. dailun

    dailun Active member

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    According to everything that I have read, 1.65v RAM will run with 1.5v, but may not run at it's highest speed.
     
    dailun, Sep 23, 2009
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  5. creaky

    creaky Moderator Staff Member

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    k7vc - You need to remove the email address from your signature, Forum Rules are in mine.
     
    creaky, Sep 23, 2009
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  6. k7vc

    k7vc Regular member

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    dailun: Thank you for your help. I found this in the P45 BIOS documentation:

    MCH Voltage Override
    • Default
    • 1.525V
    • 1.600V
    • 1.625V
    • 1.725V
    Allows you to set the MCH V_CORE voltage.
    Warning: This setting is intended for validation and test
    purposes only. Altering clock frequencies may reduce system
    stability and/or the useful life of the system and processor.
    Operation at settings beyond component specification is not
    covered by Intel component warranties. If any problems occur
    during operation at non-default settings, reset the board to
    default values.
    --
    Is this "MCH V_CORE" voltage what we've been talking about or something else?

    Dick
     
    Last edited: Sep 23, 2009
    k7vc, Sep 23, 2009
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  7. k7vc

    k7vc Regular member

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    I apologize. I thought I had that box unchecked in my messages. How can I edit my posts to remove it?

    Dick
     
    k7vc, Sep 23, 2009
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  8. creaky

    creaky Moderator Staff Member

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    Thanks. There's a pencil icon above the posts for editing.
     
    creaky, Sep 23, 2009
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  9. k7vc

    k7vc Regular member

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    You can tell how newbie'ish I am: I didn't even know what that icon meant. I do now. Getting old is tough. :(

    Dick
     
    k7vc, Sep 23, 2009
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  10. creaky

    creaky Moderator Staff Member

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    Isn't it just :)
    I'll leave your thread in peace, 'fraid i can't help with the DDR3 problem anyway.
     
    creaky, Sep 23, 2009
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  11. dailun

    dailun Active member

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    I believe that this is CPU core voltage, not RAM voltage. I will take a look at the manual or if I can my hands on one of those boards, I'll let you know.
     
    dailun, Sep 23, 2009
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  12. k7vc

    k7vc Regular member

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    Thanks dailun. I truly appreciate your help.

    Dick
     
    k7vc, Sep 23, 2009
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  13. k7vc

    k7vc Regular member

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    According to the Intel web site, MCH = Memory Controller Hub. The voltages I listed above seem to fit. I wonder....

    Dick
     
    k7vc, Sep 23, 2009
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