Multiplier stuck @35 (stock) on i5-6600k + misc. power saving options

Greetings !

I am currently in the process of overclocking my i5-6600k, on my Asus Z170 Pro Gaming motherboard. I use a Hyper 212X as an aircooling solution, and a pretty good case airflow, but that's irrelevant to my questions.
For the purpose of overclocking I disable every tool in the UEFI that can automatically alter voltages and frequencies.
My first issue is about the clock multiplier. The stock multiplier for the 6600k is 35. Upon changing the value, the UEFI successfully changes the "targeted frequency" accordingly, for example 4000 Mhz. Vcore also works fine.
However, when I check any hardware monitoring software on Windows, the Vcore is set at the value I set in the UEFI, but the multiplier is still stuck at 35, for a frequency of 3500 Mhz ! (Or 39 if I enable Intel Turbo Boost in the UEFI)
I tried different values like 40 or 45 with Turbo Boost off, and CPU-Z displays the correct multiplier bracket according to what I set (for example, 8 to 45), but the actual multiplier stays stuck at 35.
Do you know what could cause this ?

My second question was about the power saving options (Asus EPU, Intel Turbo Boost, CPU SVID support...) that alter voltages. I am pretty sure I should definitely disable every one of them during the process of overclocking. But should I re-enable them when I am sure to have a perfectly stable system, in order to reduce heat, power consumption, fan noise, component lifespan etc... ?

I thank you in advance for the answers. Keep in mind that I'm almost a beginner on this topic so every bit of information can be useful !
Reply to Strelokk
2 answers Last reply
More about multiplier stuck stock 6600k misc power saving options
  1. I would set all options, including voltage to default to begin with.
    Then, simply raise the multiplier for all cores to your desired level say 40 and test.
    Monitor with cpu-Z.
    You should see your multiplier at 40 and your vcore under 1.4

    When you reach your target, back off a notch and implement adaptive voltage and speedstep.
    That will reduce the multiplier and vcore when there is little to do.
    Windows power options should allow the cpu to run from about 20% to 100%.

    FWIW:
    As of 12/04/2016
    What percent can get an overclock at a somewhat sane 1.40v Vcore.

    I5-6600K

    4.9 14%
    4.8 38%
    4.7 67%
    4.6 87%
    Reply to geofelt
  2. geofelt said:
    I would set all options, including voltage to default to begin with.
    Then, simply raise the multiplier for all cores to your desired level say 40 and test.
    Monitor with cpu-Z.
    You should see your multiplier at 40 and your vcore under 1.4

    When you reach your target, back off a notch and implement adaptive voltage and speedstep.
    That will reduce the multiplier and vcore when there is little to do.
    Windows power options should allow the cpu to run from about 20% to 100%.

    FWIW:
    As of 12/04/2016
    What percent can get an overclock at a somewhat sane 1.40v Vcore.

    I5-6600K

    4.9 14%
    4.8 38%
    4.7 67%
    4.6 87%



    Thanks a lot for your answer.

    Turns out that I was wrong about Intel Turbo Boost, this feature was indeed required in order to overclock the CPU... I'm going to do some testing !
    Reply to Strelokk
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