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Thread: GA-P35-DQ6 default MCH voltage




  1. #1
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    Default GA-P35-DQ6 default MCH voltage

    Hi,

    What is the "normal" voltage for the northbridge (MCH) when not over-volted? Is it 1.25v?

    I don't know if its a P35 chipset default voltage or whether Gigabyte sets a default "normal" voltage(for the auto setting) from an allowed range of voltages defined in the P35 specification.

    Please enlighten me as the BIOS shows only OK or FAIL so that doesn't even tell me, and on my treks through google search results I haven't found anything too conclusive.

    Regards,

    MATT

  2. #2
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: GA-P35-DQ6 default MCH voltage

    You can see what voltages are set or being used with EasyTune 6

    As for Stock Intel Spec >>>>

    .P35 MCH datasheet:

    Power and Grounds
    Name Voltage Description
    VCC 1.25 V Core Power <----------- default MCH voltage
    VTT 1.05V/1.2 V Processor System Bus Power <----------- default FSB voltage
    VCC_EXP 1.25 V PCI Express* and DMI Power <----------- default PCI-e voltage
    VCC_DDR 1.8V/1.5V DDR2/DDR3 System Memory Power <----------- default memory voltage
    VCC_CKDDR 1.8V/1.5V DDR2/DDR3 System Clock Memory Power
    VCC3_3 3.3 V 3.3 V CMOS Power
    VCCAPLL_EXP 1.25 V PCI Express PLL Analog Power
    VCCA_DPLLA 1.25 V Display PLL A Analog Power.
    VCCA_DPLLB 1.25 V Display PLL B Analog Power.
    VCCA_HPLL 1.25 V Host PLL Analog Power
    VCCA_MPL 1.25 V System Memory PLL Analog Power
    VCCA_DAC 3.3 V Display DAC Analog Power
    VCCD_CRT 1.5/1.8 V Display Digital Supply Power
    VCCDQ_CRT 1.5/1.8V CRTDAC Power
    VCC_CL 1.25 V Controller Link Aux Power
    VSS 0 V Ground


    The FSB voltage is a bit trickier, per Intel specs:

    GTL+ Gunning Transceiver Logic signaling technology. Implements a voltage level as
    defined by VTT of 1.2 V.
    http://www.intel.com/products/deskto...ldocuments.htm



    http://www.intel.com/Assets/PDF/datasheet/316966.pdf
    Last edited by Lsdmeasap; 01-02-2009 at 04:14 PM.

  3. #3
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    Default Re: GA-P35-DQ6 default MCH voltage

    Excellent, thanks.

    I think I have seen those on a datasheet before but didn't know how to read the VCC and other terms into real world terms.

    I have heard of some of them like PLL because for a time I was going to buy an nVidia based chipset and the bios on those boards allow for changing those types of things.

  4. #4
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: GA-P35-DQ6 default MCH voltage

    GA-EP45 boards have all that >>>

    Clip from my Template I help users with for P45 >>>
    Motherboard Voltage Control
    Voltage Type.………... Manual
    CPU
    CPU Vcore….……….........................:
    CPU Termination…..... 1.200V*.......: <<< Leave
    CPU PLL…………………....1.500V*.......: << Please set to stock, Auto overvolts this way to much

    CPU Referen.…………....0.755V*.......: <<< .64% Of Vtt (Termination above) Auto Will set this correctly

    CPU Reference2………,,0.800V*.......:<<< .67% Of Vtt (Termination above) Auto Will set this correctly

    MCH/ICH
    MCH Core…………….....1.100V...........:
    MCH Reference….…….0.800V...........;
    MCH/DRAM Ref.…......0.900V...........:
    ICH I/O……………….....1.550V............:
    ICH Core…………...……1.100V............:

    DRAM
    DRAM Voltage ……....1.800V............:
    DRAM Termination .…0.900V............:
    Channel A Reference 0.900V............:
    Channel B Reference 0.900V............:

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