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X299 FTW K Bus Speed fluctuates

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Ki2is87
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2020/05/06 09:48:19 (permalink)
Hey guys,

I've noticed, the BCLK is fluctuating between 100 to 102.2Mhz while rendering. In BIOS it's set to 100Mhz.
I came accross this post, that's pretty much the same, but can't find any "spread spectrum" in the BIOS settings.
The BIOS is up to date, v.1.23.

https: //www.overclock.net/forum/5-intel-cpus/1602510-how-can-i-force-my-bclk-not-fluctuate-stay-still-100mhz-exactly-i7-5930k.html#/topics/1602510

Any ideas how I can set it to 100Mhz?
post edited by Ki2is87 - 2020/05/06 10:02:36
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    ZoranC
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    Re: X299 FTW K Bus Speed fluctuates 2020/05/06 12:43:11 (permalink)
    It is my understanding this is normal behavior with any platform, that all of them will oscillate. Which makes sense when you think about it from electrical standpoint, how voltages and frequencies oscillate in real world. There is no way for any frequency/voltage to be perfectly flat.
     
    So as long as it oscillates within normal range, it is not excessive, that is fine and there is nothing to worry about.
    #2
    TiN_EE
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    Re: X299 FTW K Bus Speed fluctuates 2020/05/07 08:38:03 (permalink)
    Spread spectrum is intentional and always on to reduce interference with wireless/USB3 stuff.
    Yes, voltages and frequencies have own instability, but it's few order of magnitudes less than 2.2MHz, so that is SS in action.

    If you have question, please post in public forum. I do not reply PMs, so all in community can benefit the answer. 
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    ZoranC
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    Re: X299 FTW K Bus Speed fluctuates 2020/05/07 11:49:23 (permalink)
    TiN_EE
    Spread spectrum is intentional and always on to reduce interference with wireless/USB3 stuff.
    Yes, voltages and frequencies have own instability, but it's few order of magnitudes less than 2.2MHz, so that is SS in action.



    Thank you for the clarification what exactly is causing it and info on orders of magnitude :)
    #4
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