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  1. #1
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    Maximus Hero XIII 10.07 / Bug Intel VMX enable

    Hi,

    it seems to be a bug - if i enable Intel VMX, BLCK is only 13,1MHZ, my i9 11900K only gets max. 700MHZ

    If I disable Intel VMX in Bios everything is o.k. an the CPU speeds up to 5,3GhZ. I tried to isolate step by step by switching BIOS-Option on/off and isolated the problem. the problem only exists if switching Intel VMX enabled.

    Any ideas? Hope for some help!
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  2. #2
    ROG Guru: Yellow Belt Array Zeroed85 PC Specs
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    Are you using Windows 11 with Core Isolation enabled? There are some issues reading parts of the CPU with Win 11 and Core Isolation enabled. I didn't think it was an issue with Intel 11th Gen proc and more Intel 10th Gen.

  3. #3
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    I have to find out, what Core Isolation means - I can't remember that I switched it on or where to switch on/off.

  4. #4
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    I asked Google.

    With tipping "Core Isolation" - in german "Kernisolierung" - in Start: Windows opens Defender, but the page for that doesn't exist (infobox) (Windows RP 22000.194). Core isolation is only available with VMX enabled.

    If I run AIDA, benchmark is significant lower than version of BIOS/VMX disabled, but not als low as i would inspect with 1/8th (13,1 instead of 100) of Frontsidebus clock. It is still much better than my old i7 7K00K.
    Last edited by meulemann; 09-28-2021 at 03:11 AM.

  5. #5
    ROG Guru: Yellow Belt Array Zeroed85 PC Specs
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    I think you have Core Isolation enabled. It's an issue with Windows 11 and Core Isolation that is not letting software read the CPU/motherboard correctly. Microsoft need to fix this on their end. Look at my 10900K in HWiNFO:

    Click image for larger version. 

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    Core Isolation is in Windows Defender/Device Security. However toggling off Memory Integrity does not work or is broken. You need to disable VMX in the BIOS.

    Click image for larger version. 

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  6. #6
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    In my case it cannot be Core Isolation, because it is not there... I have to enable VMX to get Core Isolation in Win11.

    Click image for larger version. 

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    EDIT: Sorry, you are right. The problem is gone when disabling VMX as you write.

    It's a bug in windows? It's a bug in BIOS? Hopefully it will be fixed soon because Core Isolation and Hyper-V (!) should work!
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    Last edited by meulemann; 09-28-2021 at 08:17 AM.

  7. #7
    ROG Guru: Yellow Belt Array Zeroed85 PC Specs
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    Quote Originally Posted by meulemann View Post
    In my case it cannot be Core Isolation, because it is not there... I have to enable VMX to get Core Isolation in Win11.

    Click image for larger version. 

Name:	Screenshot 2021-09-28 100645.png 
Views:	2 
Size:	110.8 KB 
ID:	90077

    EDIT: Sorry, you are right. The problem is gone when disabling VMX as you write.

    It's a bug in windows? It's a bug in BIOS? Hopefully it will be fixed soon because Core Isolation and Hyper-V (!) should work!
    Yes it's a problem with VMX in Windows 11. I think Microsoft need to fix it on their side...

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