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Thread: Z77 extreme6 and i7 2700k overclocking issue

  1. #1
    zbr
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    Question Z77 extreme6 and i7 2700k overclocking issue

    Hello.
    In the test linpack(LinX 0.6.5) reduced processing speed from 4.7Ghz to 3.5Ghz.
    How can it fix it?


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    parsec's Avatar
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    Default Re: Z77 extreme6 and i7 2700k overclocking issue

    That's strange, I can think of a few reasons for that happening.

    Do you have Turbo Boost enabled? It must be enabled to maintain your OC to 4.7GHz.

    Or, did you change the Turbo power limits or times in the BIOS? I've also heard that disabling SpeedStep (EIST) can cause that to happen.

    A processor will reduce its speed if it is too hot, thermal throttling is activated to protect the CPU. The CPU temperatures you posted do not seem to be high enough to cause that to happen, which is usually 100C.

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    zbr
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    Default Re: Z77 extreme6 and i7 2700k overclocking issue

    Quote Originally Posted by parsec View Post
    That's strange, I can think of a few reasons for that happening.

    Do you have Turbo Boost enabled? It must be enabled to maintain your OC to 4.7GHz.

    Or, did you change the Turbo power limits or times in the BIOS? I've also heard that disabling SpeedStep (EIST) can cause that to happen.

    A processor will reduce its speed if it is too hot, thermal throttling is activated to protect the CPU. The CPU temperatures you posted do not seem to be high enough to cause that to happen, which is usually 100C.
    Thank you for response.

    I made screenshots (bios and windows idle/burn):

    Intel SpeedStep: OFF
    Intel Turbo Boost: OFF
    C1E: OFF
    C3/C6: OFF
    Package C State: OFF

    bios:





    idle:

    burn:


    Do I need to do the same tests only with the included Turbo Boost and SpeedStep?

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    Default Re: Z77 extreme6 and i7 2700k overclocking issue

    Yes, just test with Turbo Boost and SpeedStep enabled. It won't take long and you'll see if it works soon after Linpack runs.

    Also, if those settings don't work, the settings for the current limits (500) may be to low. Why did you choose those? I think Auto is higher than 500.

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    zbr
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    Default Re: Z77 extreme6 and i7 2700k overclocking issue

    Quote Originally Posted by parsec View Post
    Yes, just test with Turbo Boost and SpeedStep enabled. It won't take long and you'll see if it works soon after Linpack runs.

    Also, if those settings don't work, the settings for the current limits (500) may be to low. Why did you choose those? I think Auto is higher than 500.
    I tested it with the included Turbo Boost and SpeedStep, nothing has changed. 500 is the maximum variable for this board.

    I found a issue. I use liquid cooling only for processor and video cards.
    I installed fan over processor socket and now all is good.


    My settings after testing in LinX for about 58 minutes:
    Cpu clock: ~4900 (49 49 49 49)
    Turbo voltage: +0.039v
    Offset voltage: +0.065v

    voltages:
    idle: 1.432v - 1.440v
    linx burn: 1.464v(90% of time) - 1.472v(9% of time) - 1.480v(1% of time)
    temp. max: 85C

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    Default Re: Z77 extreme6 and i7 2700k overclocking issue

    The fan fixing your problem seems to indicate that the CPU VRMs (Voltage Regulator Modules) were over heating, and limiting the power sent to the CPU. That surprises me, since your board has good heat sinks on the VRMs, which are under the heat sinks in your picture.

    But you are right about using liquid cooling on the CPU, that does not provide any air circulation to those heat sinks.

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