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Thread: Ud3r f7 bios




  1. #11
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    Default Re: Ud3r f7 bios

    Reference voltages are always specific to your setup, what works for someone else with the exact same components as you may not work for you and vice versa.


  2. #12
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: Ud3r f7 bios

    I recommend CPU Ref be left in Auto until you read a lot about how to mess around with it

    MCH Ref, for your setup.. Maybe .68-.73, please do see the link in my signature for how to set that as you do not just "set it", it must be set in conjunction with Vtt.

    And as said above All boards and chips are different so you will have to play around and do some testing, I just offer a educated guess there is all.

    I can say .76 default is almost always a bit much I think

  3. #13
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    Default Re: Ud3r f7 bios

    LSD, while we're on the subject of CPU reference voltage and Vtt, here's a quick question:

    I found I needed to increase Vtt one notch from default 1.200 to 1.220. I left CPU reference on AUTO. If I understand your posts correctly, my adjustment of Vtt to 1.22 will also correspondingly raise the CPU reference value correctly if I leave that value set to "AUTO." Is that right?

    Please refer to my post here: http://forums.tweaktown.com/f69/stab...-3-83-a-30823/ where I have increased Vtt as described above.
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  4. #14
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: Ud3r f7 bios

    Yeap, that is correct. Since you left CPU Ref in Auto the actual voltage amount applied will be changed due to the Vtt change, but the ref % will remain the default though, since you left the % in Auto.

    Here are the changes and what affects what. Also see the link in my signature for some details


    CPU Termination (Vtt) Automatically changes the following if manually set >>>

    CPU Reference Voltage (.63% of Default Vtt/1.20) .76 ET
    CPU Reference2 Voltage (.67% of Default Vtt/1.20) .80 ET
    MCH Reference Voltage (.63% of Default Vtt/1.20) .76 ET

    DRAM Voltage Automatically changes the following if manually set >>>

    MCH/DRAM Reference Voltage (.50% of Default Dram Voltage)
    DRAM Termination Voltage (.50% of Default Dram Voltage)
    Channel A Reference Voltage (.50% of Default Dram Voltage)
    Channel B Reference Voltage (.50% of Default Dram Voltage)
    Last edited by Lsdmeasap; 03-09-2009 at 04:11 AM.

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