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  1. #1
    Joined
    Dec 2014
    Posts
    4

    Roll Eyes CPU frequency always at 3797 MHz

    I have a Windows 7 Pro x64 system used as a home server.

    Hardware: Core i5, 4670K (3.4 GHz) on an ASRock Z87E-ITX with the latest UEFI firmware.

    I've discovered today that the CPU frequency is too high when the system is doing virtually nothing.

    CPU-Z shows a CPU frequency of 3797 MHz. From time to time it drops to 3597 MHz. Multiplier always at 36-38.

    Task Manager shows a cpu usage on Core 1 of 5-15%. Other cores are idle. All processes are at 0-1% cpu usage (almost all on 0%).

    EIST and all C-States are enabled in the UEFI firmware.

    When I change the power profile to power saver the multiplier drops immediately to 8 and the frequency to 799 MHz. But this mode is not an option, as when doing some CPU heavy work like packing using WinRar the frequency is at max 2100 MHz (and usually at 1200), so it's too slow. Additionally the LAN speed goes from about 95 MB /sec to 8 MB /sec (file copy).

    If I go back to the Balanced power profile (with default settings) the CPU frequency goes within a second to 3797 MHz and stays there.

    I have tried everything besides reinstalling Windows, and still have no idea what causes it.

    I hope somebody has the answer why the CPU frequency is so high all the time.

  2. #2
    Joined
    Dec 2014
    Posts
    4

    Re: CPU frequency always at 3797 MHz

    New discovery:

    I've just discovered in Resource Monitor that "System Interrupts" is at 10-15% CPU Usage all the time. On other PCs here "System Interrupts" CPU Usage is at 0%.

  3. #3
    Joined
    Dec 2014
    Posts
    4

    Re: CPU frequency always at 3797 MHz

    Found the solution! The culprit was the Intel Graphics driver! I've updated it to the latest version several weeks ago. Uninstalling the driver solved the problem right away (even without a reboot)! I've then installed the old gfx driver offered by Windows Update and the problem remains still solved. 799 MHz at idle with balanced profile!!

  4. #4
    Joined
    Aug 2000
    Location
    Vvardenfell
    Age
    56
    Posts
    10,836

    Re: CPU frequency always at 3797 MHz

    Weird, but well done for finding it.

  5. #5
    Joined
    Mar 2002
    Location
    California
    Posts
    25,347

    Re: CPU frequency always at 3797 MHz

    ^^ late to the party here, but that is a good catch. Was updating the GPU drivers simply a fluke?
    "The most dangerous myth is the demagoguery that business can be made to pay a larger share, thus relieving the individual. Politicians preaching this are either deliberately dishonest, or economically illiterate, and either one should scare us...
    Only people pay taxes, and people pay as consumers every tax that is assessed against a business."


    -The Gipper


  6. #6
    Joined
    Dec 2014
    Posts
    4

    Re: CPU frequency always at 3797 MHz

    I don't think so. https://communities.intel.com/thread/56126

    I think rather there is no quality control at intel driver development.

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