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Thread: GA-P35-DS3 - manual FSB Clock change problem




  1. #1
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    Angry GA-P35-DS3 - manual FSB Clock change problem

    Hi !

    I have a GA-P35-DS3 motherboard, C2D E4600 2,4GHz, 2x2GB DDR2 OCZ DUAL, Palit Geforce 8600GT.
    In BIOS -> Inteligent Tweaker i have the following options:
    CPU Host Clock Control: Disable
    CPU Host Frequency: 200 (read only)
    CPU Clock Ratio: 12x

    OK - i want to increse FSB so I turn on CPU Host Clock Control .
    CPU Host Frequency is now enabled, but at the moment I'm changing nothing - still I have a 200 MHz FSB.
    Save and Exit BIOS, restart...post screen...restart...BIOS restored
    previous settings :(
    I can't manualy change FSB !

    The same problem is with PCI Express Frequency. If I manually change
    this option form "Auto" to 100 (default !), I have a same problem, restart and
    restored settings :(

    I have a newest BIOS. Does somebody have similar problem?

    Sorry for my English.

  2. #2
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: GA-P35-DS3 - manual FSB Clock change problem

    Well I suggest a few things for 2x2GB that is likely your problem, you need some voltage adjustments for that to run and stably boot. First Be SURE you turn off C1E, TM2, EIST, and C.I.A.2

    And you may need some CPU voltage bump as well, I have never used that CPU so you will have to try to guess what is better, just add a bit more until It boots. Dont go over 1.45ish though, that would be the upper range and not needed until you were at the high end of your CPU.

    I do not know your ram specs so I used 5-5-5 timings CAS timing, if yours is 4 use that. And I do suggest nothing should be on AUTO except for a few things, which I dont think your BIOS has

    Add or remove anything needed and post back what you are trying after trying these suggested settings.


    Robust Graphics Booster___________ [Auto]
    CPU Clock Ratio ____________ [12]
    CPU Host Clock Control_ [Enabled]
    CPU Host Frequency (MHz)__________ [200]
    PCI Express Frequency (Mhz)_______ [100]
    C.I.A. 2__________________________ [Disabled]
    System Memory Multiplier (SPD)____ [2.00] << Set to what you want your ram running at 2.0 is 1:1
    DRAM Timing Selectable_______ SPD __ [Manual]

    CAS Latency Time________________ 5
    Dram RAS# to CAS# Delay_________ 5
    Dram RAS# Precharge Delay_______5
    Precharge Delay (tRAS)__________ 15

    Start high working your way lower once you get it booting and running better >>>

    ACT to ACT Delay (tRRD)_________ 3-4
    Rank Write to READ Delay________ 9-11
    Write to Precharge Delay_________ 3-6
    Refresh to ACT Delay______________ 42 If that does not work do 52-62
    Read to Precharge Delay__________ 3-5
    Static tRead Value_______________ 7-10
    Static tRead Phase Adjust________ 1-31 <<< If you have leave on auto or 1-31 or 0

    System Voltage Control____ [Manual]
    DDR2 OverVoltage Control__ [+0.300V] <<< Set to your Rams Sticker Voltage +.3 is 2.1V
    PCI-E OverVoltage Control_ [+0.1V]
    FSB OverVoltage Control___ [+0.1V]
    (G)MCH OverVoltage Control [+0.1V - +0.125-.15V] << This is a MUST for 2X2GB ram
    CPU Voltage Control_______ [1.25] << Make what your says, but a bit more

  3. #3
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    Default Re: GA-P35-DS3 - manual FSB Clock change problem

    It's doesn't work for me :(
    In auto mode everything is working fine. I don't understand why I can't change "CPU Host Clock Control" option from Auto Mode (200 MHz) to Manual (200 MHz) ! This option only has the influence on option FSB clock rate, which I can change manually.

  4. #4
    Lsdmeasap's Avatar
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    Default Re: GA-P35-DS3 - manual FSB Clock change problem

    Do you see most of the above settings? If not on the main page of the BIOS hit Control + F1 then go into MIT

    You MUST make the MCH voltage adjustment for your board to post with 2x2GB sticks, aside from that you did not reply very well. I mean I have no clue what your issue is if you do not post back your settings you are trying, If you want a image will be fine as well.

    When you change to manual, what are you trying to run your memory on Frequency wise?

  5. #5
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    Default Re: GA-P35-DS3 - manual FSB Clock change problem

    OK - i have the following settings:

    Robust Graphics Booster___________ [Auto]
    CPU Clock Ratio ____________ [12]
    CPU Host Clock Control_ [Disabled] <<- I want to Enable this option
    CPU Host Frequency (MHz)__________ [200]
    PCI Express Frequency (Mhz)_______ [Auto] (default 100)
    C.I.A. 2__________________________ [Disabled]
    System Memory Multiplier (SPD)____ [Auto]
    DRAM Timing Selectable_______ SPD __ [Auto]
    CAS Latency Time________________ 6
    Dram RAS# to CAS# Delay_________ 6
    Dram RAS# Precharge Delay_______6
    Precharge Delay (tRAS)__________ 18

    ACT to ACT Delay (tRRD)_________ 3
    Rank Write to READ Delay________ 3
    Write to Precharge Delay_________ 6
    Refresh to ACT Delay______________ 46
    Read to Precharge Delay__________ 3
    Static tRead Value_______________ 3
    Static tRead Phase Adjust________ 0

    System Voltage Control____ [Manual]
    DDR2 OverVoltage Control__ [+0.300V]
    PCI-E OverVoltage Control_ [+0.1V]
    FSB OverVoltage Control___ [+0.1V]
    (G)MCH OverVoltage Control [+0.1V]
    CPU Voltage Control_______ [Auto] (1,32500 V) .

    On this settings it's all OK. After I change memory settings to suggested by you still everything is working fine. But a change option "CPU Host Clock Control" to Enabled is critical (FSB is still 200 MHz !). After this change the computer is doing the restart and restoring previous setting.

    Edit: After first restart (after I save new settings in BIOS) the memory is correctly detecting in POST menu. The restart is coming before detecting IDE/SATA devices.
    Last edited by slash83; 04-28-2008 at 02:46 PM.

  6. #6
    Lsdmeasap's Avatar
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    Default Re: GA-P35-DS3 - manual FSB Clock change problem

    This is not OK, 6 will likely not work with 2x2GB sitcks let alone 3. Change to 7 or 8 then try enable on the CPU host clock control. Until you get your settings right it will keep rebooting and giving you defaults

    Static tRead Value_______________ 3 <<< Change this to 7 or 8 good is 7-10!!!!

    6 will only work on Very expensive ram, and or at very LOW frequency

    You may also need act to act on 4-5

  7. #7
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    Default Re: GA-P35-DS3 - manual FSB Clock change problem

    Thanks for help, but still doesn't work :(
    I am afraid that it is not a memory problem, maybe I have a broken motherboard, maybe a bug in BIOS ?
    It's strange that nobody has the similar problem :(

  8. #8
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    Default Re: GA-P35-DS3 - manual FSB Clock change problem

    Are you SURE you are trying the settings I suggested? If not or if so, try this ALL OF IT

    Robust Graphics Booster___________ [Auto]
    CPU Clock Ratio ____________ [12]
    CPU Host Clock Control_ [Enabled]
    CPU Host Frequency (MHz)__________ [200]
    PCI Express Frequency (Mhz)_______ [100 SET THIS ALWAYS Auto is not good]
    C.I.A. 2__________________________ [Disabled]

    System Memory Multiplier (SPD)____ [Set this to 4.0 for 800Mhz Or which ever is closer to 800Mhz]

    DRAM Timing Selectable_______ SPD __ [Manual]

    CAS Latency Time________________ 6
    Dram RAS# to CAS# Delay_________ 6
    Dram RAS# Precharge Delay_______6
    Precharge Delay (tRAS)__________ 18

    ACT to ACT Delay (tRRD)_________ 4
    Rank Write to READ Delay________ 11
    Write to Precharge Delay_________ 6
    Refresh to ACT Delay______________ 62
    Read to Precharge Delay__________ 6
    Static tRead Value_______________ 10
    Static tRead Phase Adjust________ Auto/1-31/0

    System Voltage Control____ [Manual]
    DDR2 OverVoltage Control__ [+0.300V]
    PCI-E OverVoltage Control_ [+0.1V]
    FSB OverVoltage Control___ [+0.1V]
    (G)MCH OverVoltage Control [+0.1V or .15]
    CPU Voltage Control_______ [Auto] (1,32500 V) Set to 1.35 or a bit more for now while testing

  9. #9
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    Default Re: GA-P35-DS3 - manual FSB Clock change problem

    Yes, i'm trying your settings.
    On Static tRead Value=10 computer is not up. I changed this value to 6.
    But I still can't change CPU Host Clock Control to Manual. Computer is starting, POST: Graphics card, memory, info: "memory runs at Dual Channel Interleaved". Here should be detecting IDE devices but computer is restarting.

    The same problem is with "PCI Express Frequency" - I can't change from Auto to 100 MHz :(

  10. #10
    Lsdmeasap's Avatar
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    Default Re: GA-P35-DS3 - manual FSB Clock change problem

    Is the computer double or triple booting when you hit save and apply? If so you still do not have the settings correct?

    Have you tried booting with only 1 stick of ram in slot 1? And if you have it try only one stick of 1gb.

    If still no luck, take everything out but 1 stick of ram. Meaning hard drives, optical drives, and graphics card remove them and see if it still is rebooting, if not then it is your graphics card or one of those sticks of ram is bad. Or possibly your power supply is going bad. If one stick works with nothing else connected and it does not reboot on you, shut down and hook up your hard drive only and see if it is still ok. And so on until you find the problem

    What PSU is it? And have you used this system before or are you just building it?

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