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Thread: Tweaking i7 920 + GA-EX58-UD3R 24/7 low-volt OC




  1. #1
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    Default Tweaking i7 920 + GA-EX58-UD3R 24/7 low-volt OC

    Hello everyone, after hitting 3.8 stable at 1.25v, I decided that I wanted a sub-1.2v 27/4 OC as the 3.8 is spinning up my idle fan speed to noticeably higher noise levels (even though it's only a bit higher, I didn't like it), so I got 170x20 (w/turbo) going here stable, 35/40 idle, 60/65 load, with 25 ambient, but I have a few questions before I start lowering voltages.

    1. When I raise CPU Clock Drive to 800mV and PCI Express Clock drive to 900mV with "Optimized settings", the IOH Core gets changed from AUTO to 1.24, is this normal?
    2. Any other voltages that I should change from AUTO?
    3. Can I safely lower CPU PLL voltage to below 1.8v?
    4. Should I even bother running memory on its correct timings? My friend is saying that it doesn't make that much of a difference.

    Thanks!

    My system: i7 920 D0, Gigabyte GA-EX58-UD3R 1.6 (FB Bios), OCZ gold 3x2GB, Xigmatek DK, XFX 5850, Corsair tx750, Antec p182

    Code:
    Advanced CPU Features:
    CPU Clock Ratio ................................ [20x]
    Intel(R) Turbo Boost Tech .................. [Enabled]
    CPU Cores Enabled ............................ [All]
    CPU Multi Threading .......................... [Enabled]
    CPU Enhanced Halt (C1E) ................... [Enabled]
    C3/C6/C7 State Support .................... [Enabled]
    CPU Thermal Monitor ......................... [Enabled]
    CPU EIST Function ............................ [Enabled]
    Virtualization Technology ................... [Disabled] 
    Bi-Directional PROCHOT ..................... [Disabled]
    
    
    Uncore & QPI Features:
    QPI Link Speed .............................. x36
    Uncore Frequency .......................... x17
    Isonchronous Frequency ..................[Enabled]
    
    
    Standard Clock Control:
    Base Clock (BCLK) Control ................ [Enabled]
    BCLK Frequency (MHz)  .....................170
    PCI Express Frequency (MHz) ........... [AUTO]
    
    C.I.A.2 [Disabled]
    
    Advanced Clock Control:
    CPU Clock Drive ..............................[800mV]
    PCI Express Clock Drive ................... [900mV]
    CPU Clock Skew ............................. [0ps]
    IOH Clock Skew ............................. [0ps]
    
    
    Advanced DRAM Features:
    System Memory Multiplier (SPD) ........ 8x
    DRAM Timing Selectable (SPD) .......... [Quick] 
    
    Channel A + B + C
    
    Channel A Timing Settings:
    ##Channel A Standard Timing Control## set to your rams spec ie
    CAS Latency Time ......................8
    tRCD .......................................8
    tRP .........................................8
    tRAS .......................................24
    Command Rate (CMD) ................1
    
    Below values arey be left in Auto
    
    ##Channel A Advanced Timing Control##
    tRC ........................................ 
    tRRD .......................................
    tWTR ...................................... 
    tWR .............
    tWTP ....................................... 
    tWL ........................................
    tRFC .......................................
    tRTP .......................................
    tFAW ......................................
    
    
    ##Channel A Misc Timing Control##
    Round Trip Latency ...................
    
    
    
    Advanced Voltage Control:
    
    CPU
    Load Line Calibration ................. [Disabled]
    CPU Vcore ...............................1.200v
    QPI/VTT Voltage 1.150v ............1.295v
    CPU PLL 1.800v .......................1.800v
    
    MCH/ICH
    PCIE 1.500v ...........................auto
    QPI PLL 1.100v .......................auto
    IOH Core 1.100v .....................1.240v
    ICH I/O 1.500v .......................auto
    ICH Core 1.1v ........................auto
    
    DRAM
    DRAM Voltage 1.500v ..............1.64
    DRAM Termination 0.750v [AUTO]
    Ch-A Data VRef. 0.750v [AUTO]
    Ch-B Data VRef. 0.750v [AUTO]
    Ch-C Data VRef. 0.750v [AUTO]
    Ch-A Address VRef. 0.750v [AUTO]
    Ch-B Address VRef. 0.750v [AUTO]
    Ch-C Address VRef. 0.750v [AUTO]

  2. #2
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: Tweaking i7 920 + GA-EX58-UD3R 24/7 low-volt OC

    Are you raising the Clock drives yourself, or loading optimized defaults as there is a difference?

    IOH core may increase in auto due to your overclock, and you may or may not need that much. I suggest setting it manually and testing to find what you need, I used to run 1.2-1.24 but lately have noticed that 1.14 or so is stable so you may want to test out a few ranges.

    The other voltages you have set to auto above are fine if you would like to leave them, just verify in Easytune that they are not being set to some crazy amount, which they shouldn't be anyway but best to check.

    There has been much discussion on low CPU PLL, you will just have to try it out yourself and see. I have seen users stable with 1.3-1.7 so you may be ok to do so, not sure if it is safe but I would assume so as I read some EVGA developers commenting on it at their forums and I think they would have said if it could cause damage. I think the most lowering it could do would be cause instability

    Yes, set your ram to the proper timings if you have not already

  3. #3
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    Default Re: Tweaking i7 920 + GA-EX58-UD3R 24/7 low-volt OC

    When I noticed the problem with the IOH core I was setting it using F7 for optimized defaults on the Standard Clock Control screen. Just to make sure, I went into the BIOS and set the two Clock Drive values manually and the IOH changed anyway (this time to 1.22). I tried go into the voltage control and set IOH core to auto, but then the two Clock Drive values get changed to 700mV automatically after I set the voltage. This is all very weird.

    Thanks for clearing up the other questions as well :)

  4. #4
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: Tweaking i7 920 + GA-EX58-UD3R 24/7 low-volt OC

    Yes, it should not do either of those things you mention.

    I would either clear the CMOS fully for an extended period, or flash a new BIOS. Then load optimized defaults and save/apply and reboot back to the BIOS, then set your SATA/Disk settings again and then move onto all your other settings.

    Optimized clock settings will automatically be 800/900, fail safe auto would be 700/700. IOH should not be affected by changing these, in optimized default anyway I am not sure about Fail Safe as I never use it and it is not suggested.

    IOH should not change clock drives, and clock drives should not change IOH.

  5. #5
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    Default Re: Tweaking i7 920 + GA-EX58-UD3R 24/7 low-volt OC

    I put off updating the BIOS, but I have it done now, updated to FI, and the IOH core problem is no longer there.

    Awesome, thanks for all of your help, cheers.

  6. #6
    Lsdmeasap's Avatar
    Lsdmeasap is offline GIGABYTE Guru
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    Default Re: Tweaking i7 920 + GA-EX58-UD3R 24/7 low-volt OC

    Ahh nice to see your flash went well, and it corrected your IOH bug too!

    Post back anytime if you need more help with anything

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