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Thread: Cannot reach the 4GHz barrier on my core i7 920 bloomfield




  1. #1
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    Default Cannot reach the 4GHz barrier on my core i7 920 bloomfield

    Hi
    First of all this is a nice informative forum, and it have helped me out a lot with overclocking. well first a little info of my system and my settings

    CPU = Model 920 bloomfield 2.6GHz
    Motherboard = GA-EX58-Extreme
    BIOS Version = F13q
    Ram = Corsair TR3X6G1600C8D, 3x2048MB DDR3
    Graphic = Radeon HD4870x2 2GB
    PSU = 850w none modular
    Cooling = Water (cores do not exceed 68c, when runnning burnin test).

    Code:
    Advanced CPU Features:
    CPU Clock Ratio ................................ [19x]
    Intel(R) Turbo Boost Tech ...................... [Disable]
    CPU Cores Enabled .............................. [All]
    CPU Multi Threading ............................ [Enabled]
    CPU Enhanced Halt (C1E) ........................ [Disabled]
    C3/C6/C7 State Support ......................... [Disabled]
    CPU Thermal Monitor ............................ [Enabled]
    CPU EIST Function .............................. [Disabled]
    Virtualization Technology ...................... [Enabled]
    Bi-Directional PROCHOT ......................... [Enabled]
    
    
    Uncore & QPI Features:
    QPI Link Speed ................................. x36
    Uncore Frequency ............................... x16 [3200Mhz]
    Isonchronous Frequency ......................... [Enabled]
    
    
    Standard Clock Control:
    Base Clock (BCLK) Control ...................... [Enabled]
    BCLK Frequency (MHz) ........................... [200]
    PCI Express Frequency (MHz) .................... [100]
    
    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:
    Performance Enhance ...................... [Standard]
    Extreme Memory Profile (X.M.P) ........... [Disabled]
    System Memory Multiplier (SPD) ........... x8 [1600Mhz]
    DRAM Timing Selectable (SPD) ............. [Auto]
    
    Advanced Voltage Control:
    
    CPU
    Load Line Calibration .................... [Enable]
    CPU Vcore 1.300v.......................... [Normal] Dynamic +0.050
    QPI/VTT Voltage 1.150v ................... [1.360]
    CPU PLL 1.800v ........................... [1.840]
    
    MCH/ICH
    PCIE 1.500v .............................. [Auto]
    QPI PLL 1.100v ........................... [1.140]
    IOH Core 1.100v .......................... [1.140]
    ICH I/O 1.500v ........................... [Auto]
    ICH Core 1.1v ............................ [Auto]
    
    DRAM
    DRAM Voltage 1.500v ...................... [1.660]
    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]
    As it can be seen from the settings above i only need to increase my CPU multiplier from x19 to x20 to achieve 4GHz.
    It should be noted that the system is stable with these settings.
    However when i increase the multiplier, my windows 7 x64 pro crashes when it boots. Sometimes i get this stop code
    0X00000124 << Incorrect QPI/Vtt Voltage (To Much/Not Enough)
    But since, as I've read, my QPI/Vtt Voltage is already at max. I've only tried to decrease it slightly (My memory's SPD, says that the QPI should be on 1.35V).
    Ive also tried slowly to increase my Vcore from 1.3000v + 0.050v to 1.3000v + 0.1000v where after i stopped since everywhere i look people mention that the Vcore should be between 1.3v - 1.375v.

    So now I'm a bit lost, is this just fate and im stuck at this speed. or is there an alternative i haven't tried yet.

    Regards Optimist

  2. #2
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    Default Re: Cannot reach the 4GHz barrier on my core i7 920 bloomfield

    Hmm looks like I haven't done something obviously wrong here by the lack of responses. :-D

    Though I have another question. What is the Max Vcore voltage the Core i7 920 bloomfield can handle. ? some say 1.375 others say up to 1.550. not sure what to trust.

    Regards

    Optimist

  3. #3
    Chike is offline Senior Member
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    Default Re: Cannot reach the 4GHz barrier on my core i7 920 bloomfield

    VID range is 0.8-1.375v, this means that is CPUs that ship will have VID in this range.
    When you overclock you should decide for yourself.
    Intel® Core™ i7-900 Desktop Processor Extreme Edition Series and Intel® Core™ i7-900 Desktop Processor Series on 32-nm Process Datasheet, Volume 1, 2.10, 2.11

  4. #4
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    Default Re: Cannot reach the 4GHz barrier on my core i7 920 bloomfield

    Ok thank you, so i take it the max safe range is 1.375, and going above that is going outside specs. Any note on how far you can push it before it becomes fatal for the CPU, even with adequate cooling ?

  5. #5
    Chike is offline Senior Member
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    Default Re: Cannot reach the 4GHz barrier on my core i7 920 bloomfield

    Look around and see what peaople use fro 24/7.
    The GIGABYTE Forum is a better place to post.

  6. #6
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    Default Re: Cannot reach the 4GHz barrier on my core i7 920 bloomfield

    You should need around 1.25-1.35v cpu-v for 4ghz,if it was failing on 124 error then you should raise qpi/vtt voltage not cpu,you can use 1.3-1.4v for qpi so don't be scared to use more,it all depends on your cpu's imc(integrated memory controller)
    Last edited by wazza300; 02-07-2011 at 11:26 AM.
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  7. #7
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    Default Re: Cannot reach the 4GHz barrier on my core i7 920 bloomfield

    Ok thank you ill give it a go tonite.

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    Default Re: Cannot reach the 4GHz barrier on my core i7 920 bloomfield

    Well i guess i just have a poor quality CPU then, ive been testing it with various settings. and as the settings are now i can see with OCCT that my CPU Core#1-4 jumps to around 80c when using 100% and right back to 45c when under 30% utilization. However the Core temp is a stady 40c regardless.

    so i guess its a temp problem, also if i set my Vcore is 1.36V when set to auto in the bios at 3.8Ghz

    So i dont beleve im going to get any higher unless i find a way to press my water cooling system to dissipate even more heat.

  9. #9
    Chike is offline Senior Member
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    Default Re: Cannot reach the 4GHz barrier on my core i7 920 bloomfield

    Which of the tests give 80c core temps CPU OCCT or CPU LINPACK.
    Which cooling system is it and what is the ambiant temperture?

  10. #10
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    Default Re: Cannot reach the 4GHz barrier on my core i7 920 bloomfield

    OCCT CPU: LINPACK

    i guess the ambient temp is around 25c. when idle and AIDA64 ( everest ) gives the following readings

    CPU 29c
    CPU #1 / Core #1 45c
    CPU #1 / Core #2 44c
    CPU #1 / Core #3 58c
    CPU #1 / Core #4 40c

    Its the four cores temperaturs that jump to 80c when in goes to 100% load, and its almost instantly both up to 80c and back down to 45 - 50c.

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