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Thread: Core i7 4Ghz Club & Overclocking Guide

  1. #2833
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    Default Re: Core i7 4Ghz Club & Overclocking Guide

    Hello,
    I feel it is definitely time to overclock my machine. I have been playing around with this for a few days now, but have not had what seems to be any luck. I have gotten the CPU up to 4.0 GHz, but when I run prime95 it drops to 3.207 GHz and stays there. Temperatures have never gotten above 59 degrees C, according to Real Temp, though that shows it also at 3.2 GHz. The settings I used were as follows:

    On the P6T Deluxe w/ i7 965EE.
    Ai Tweaker : Manual
    CPU Ratio: 30
    Speed Step: Disabled
    BCLK: 133
    PCI Frequency: 100
    DRAM Frequency: DDR3-1600 MHz
    UCLK Frequency: 3200 MHz
    QPI Frequency: 4800 MT/s
    CPU Voltage: 1.45
    CPU PLL: Auto
    QPI Voltage: 1.45
    DRAM Bus Voltage: 1.64
    Load-Line Calibration: Enabled
    Everything else was auto.


    As I said when I had it at idle it remained at 4.0 GHz, but soon as I put a load on it everything dropped to 3.2 GHz. I ran prime95 for close to 6 hours, and only had one worker error out and that was at 5 hours and 58 minutes. I only shut it down since the machine was requiring a reboot for updates. Since it never stayed at 4.0 GHz during the test, I changed all the BIOS settings back to Auto. This time I ran Prime95 for 3 hours, and within 2 hours had 5 workers error out. The temperatures never got above 49 degrees C, and it fluctuated up to 3.3 GHz and back to 3.2 GHz. The biggest question I have is should it have dropped to 3.2 GHz when I ran Prime95? If not, where had I gone wrong?

    Thank You in advance.

  2. #2834
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    Default Re: Core i7 4Ghz Club & Overclocking Guide

    Try putting the UCLK Freq to auto

  3. #2835
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    Default Re: Core i7 4Ghz Club & Overclocking Guide

    Quote Originally Posted by MikeRM2 View Post
    Hello,
    I feel it is definitely time to overclock my machine. I have been playing around with this for a few days now, but have not had what seems to be any luck. I have gotten the CPU up to 4.0 GHz, but when I run prime95 it drops to 3.207 GHz and stays there. Temperatures have never gotten above 59 degrees C, according to Real Temp, though that shows it also at 3.2 GHz. The settings I used were as follows:

    On the P6T Deluxe w/ i7 965EE.
    Ai Tweaker : Manual
    CPU Ratio: 30
    Speed Step: Disabled
    BCLK: 133
    PCI Frequency: 100
    DRAM Frequency: DDR3-1600 MHz
    UCLK Frequency: 3200 MHz
    QPI Frequency: 4800 MT/s
    CPU Voltage: 1.45
    CPU PLL: Auto
    QPI Voltage: 1.45
    DRAM Bus Voltage: 1.64
    Load-Line Calibration: Enabled
    Everything else was auto.


    As I said when I had it at idle it remained at 4.0 GHz, but soon as I put a load on it everything dropped to 3.2 GHz. I ran prime95 for close to 6 hours, and only had one worker error out and that was at 5 hours and 58 minutes. I only shut it down since the machine was requiring a reboot for updates. Since it never stayed at 4.0 GHz during the test, I changed all the BIOS settings back to Auto. This time I ran Prime95 for 3 hours, and within 2 hours had 5 workers error out. The temperatures never got above 49 degrees C, and it fluctuated up to 3.3 GHz and back to 3.2 GHz. The biggest question I have is should it have dropped to 3.2 GHz when I ran Prime95? If not, where had I gone wrong?

    Thank You in advance.
    To avoid throttling (clocking down), you need to disable in the BIOS Speedstep, C1E and TM functions. I think all i7 965 are C0/C1 revision, so they suck at overclocking compared to the newer D0 revision, also you'll need a good AIR Cooler or AIO WC to maintain the temps in the range. Try to stay below 85C on all cores during the stress testing.

    Always look beyond the limits...

  4. #2836
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    Default Re: Core i7 4Ghz Club & Overclocking Guide

    This should the 5Ghz Club, 4Ghz is stock on most CPUs now LOL.

    "A lawyer with his briefcase can steal more than a hundred men with guns."

  5. #2837
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    Default Re: Core i7 4Ghz Club & Overclocking Guide

    Quote Originally Posted by alan1476 View Post
    This should the 5Ghz Club, 4Ghz is stock on most CPUs now LOL.
    Yup, but don't forget that he has an LGA 1366 CPU (Bloomfield), and X58 board, where the dream limit was 4.0GHz.

    Always look beyond the limits...

  6. The following user thanks Smiki007 For this above post:

    alan1476 (14-07-2015)

  7. #2838
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    Default Re: Core i7 4Ghz Club & Overclocking Guide

    You are correct. Thanks Smiki007.

    "A lawyer with his briefcase can steal more than a hundred men with guns."

  8. The following user thanks alan1476 For this above post:

    Smiki007 (14-07-2015)

  9. #2839
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    Default Re: Core i7 4Ghz Club & Overclocking Guide

    Quote Originally Posted by alan1476 View Post
    You are correct. Thanks Smiki007.
    You're welcome Alan.

    Always look beyond the limits...

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    Default Re: Core i7 4Ghz Club & Overclocking Guide

    Time to bid a fond farewell to my i7 920 ...

    This past week it started failing badly - intermittent hardware machinechecks (timing failures) across multiple cores causing freezes and crashes. Was a nice self-built LGA 1366 system: an Intel i7 920 with 4 cores and 8 threads that I was running overclocked [air cooled] at a stable 4.2 GHz from the original base 2.67 GHz. Very reliable for a good 8 years, so I certainly got my money's worth.
    Alternate System: i7 3930K @ 4.6GHz, ASUS Rampage IV Formula, 16GB Corsair Vengeance, AMD 6990, Samsung 840 Pro 256GB, Cooler Master HAF XB, Seasonic X-1250, various NoiseBlocker e-Loop fans.

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    Default Re: Core i7 4Ghz Club & Overclocking Guide

    Quote Originally Posted by ZeroChill View Post
    Time to bid a fond farewell to my i7 920 ...

    This past week it started failing badly - intermittent hardware machinechecks (timing failures) across multiple cores causing freezes and crashes. Was a nice self-built LGA 1366 system: an Intel i7 920 with 4 cores and 8 threads that I was running overclocked [air cooled] at a stable 4.2 GHz from the original base 2.67 GHz. Very reliable for a good 8 years, so I certainly got my money's worth.
    All good things will come to an end sooner or later in your case you had plenty of time with your old favorite so its time to move on and build another!

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    Default Re: Core i7 4Ghz Club & Overclocking Guide

    All good things must come to an end. What does the future hold?

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    Default Re: Core i7 4Ghz Club & Overclocking Guide

    Sorry to revive an old post but I'm struggling with stable overclocks with my current setup using an i7 975 Extreme Bloomfield CPU.

    I have a Gigabyte X58a-ud3r mobo with two sets of triple channel ddr3 1600 memory to make 12GB in total. One set of memory has slightly slower timings than the other so I have set them to run at that lowest setting for now and running 1.5v.

    I have a water cooled setup but I can't seem to overclock more than 4Ghz without the system crashing out of windows.... This is pretty disappointing as I had the old i7 920 running at 3.8Ghz quite happily... Is there anything I can do to help increase this figure and improve stability before I chuck everything in the bin and buy a newer rig?

    Current settings are :

    Core speed: 3996Mhz
    Muliplier: x30
    Bus speed : 133Mhz
    QPI Link : 2398Mhz
    Core voltage : 1.45v (but running at 1.376v in CPU-Z)
    Memory Frequency : 666Mhz
    FSBRAM: 2:1
    Cl: 9
    Trcd: 9
    Trp: 9
    Tras: 24
    Trfc: 74

    Currently XMP is disabled. I'm fairly a lot of my issues are to do with memory but I can't be sure...

    Any help is much appreciated!

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