Core Isolation affects CPU bus clock?


BrianInEngland

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Until recently I'd never enabled Core Isolation in the security settings. I switched it on a few weeks ago for the first time.

Running HWInfo yesterday I noticed that the CPU bus clock was ~98.5MHZ, and not 100MHz meaning that the CPU never reached it's peak speed (3700). Also the RAM clock was ~1780Mhz and not 1800. RAM is using XMP but the CPU is stock, I'm not one to fiddle with CPU BIOS settings.

After a panic thinking I had a hardware issue, I switched Core Isolation off again - and sure enough the base clock and RAM now run at the full speed.

I'm guessing this is by design? An overhead created by using HVCI?
 

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  • OS
    Windows 11 Pro 23H2 (RP channel)
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    AMD Ryzen 5900X 12-core
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Hi,
Yep
Virtualization features need to be disabled in bios

If you don't want to do that you can try an older portable version 6.08 and the issue might not happen or it doesn't for me but those features you state do need to be disabled.
But with VM features enabled in bios you can still use vm of windows or linux just not core isolation

 

My Computer

System One

  • OS
    Win-7-10-11Pro's
    Computer type
    PC/Desktop
    Manufacturer/Model
    Acer 17" Nitro 7840sn/ 2x16gb 5600c40/ 4060/ stock 1tb-os/ 4tb sn850x
    CPU
    10900k & 9940x & 5930k
    Motherboard
    z490-Apex & x299-Apex & x99-Sabertooth
    Memory
    Trident-Z Royal 4000c16 2x16gb & Trident-Z 3600c16 4x8gb & 3200c14 4x8gb
    Graphics Card(s)
    Titan Xp & 1080ti FTW3 & evga 980ti gaming
    Sound Card
    Onboard Realtek x3
    Monitor(s) Displays
    1-AOC G2460PG 24"G-Sync 144Hz/ 2nd 1-ASUS VG248QE 24"/ 3rd LG 43" series
    Screen Resolution
    1920-1080 not sure what the t.v is besides 43" class scales from 1920-1080 perfectly
    Hard Drives
    2-WD-sn850x 4tb/ 970evo+500gb/ 980 pro 2tb.
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    1000p2 & 1200p2 & 850p2
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    D450 x2 & 1 Test bench in cherry Entertainment center
    Cooling
    Custom water loops x3 with 2x mora 360mm rads only 980ti gaming air cooled
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    G710+x3
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    Redragon x3
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    xfinity gigabyte
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Hi,
Yep
Virtualization features need to be disabled in bios

If you don't want to do that you can try an older portable version 6.08 and the issue might not happen or it doesn't for me but those features you state do need to be disabled.
But with VM features enabled in bios you can still use vm of windows or linux just not core isolation

Virtualization is enabled in BIOS, I've disabled core isolation and now get full speed RAM and CPU bus. I've managed for years without it anyway.
 

My Computer

System One

  • OS
    Windows 11 Pro 23H2 (RP channel)
    Computer type
    PC/Desktop
    Manufacturer/Model
    Gigabyte
    CPU
    AMD Ryzen 5900X 12-core
    Motherboard
    X570 Aorus Xtreme
    Memory
    64GB Corsair Platinum RGB 3600MHz CL16
    Graphics Card(s)
    MSI Suprim X 3080 Ti
    Sound Card
    Soundblaster AE-5 Plus
    Monitor(s) Displays
    ASUS TUF Gaming VG289Q
    Screen Resolution
    3840x2160
    Hard Drives
    Samsung 990 Pro 2TB
    Samsung 980 Pro 2TB
    Samsung 970 Evo Plus 1TB
    Samsung 870 Evo 4TB
    Samsung T7 Touch 1TB
    PSU
    Asus ROG Strix 1000W
    Case
    Corsair D750 Airflow
    Cooling
    Noctua NH-D15S
    Keyboard
    Asus ROG Flare
    Mouse
    Logitech G903 with PowerPlay charger
    Internet Speed
    500Mb/sec
    Browser
    Microsoft Edge
    Antivirus
    Windows Defender
By the way this is what I got even with core isolation/... disabled
Wish they would get with cpu-z this is a world record :lmao:
7.42-messing up.PNG
 

My Computer

System One

  • OS
    Win-7-10-11Pro's
    Computer type
    PC/Desktop
    Manufacturer/Model
    Acer 17" Nitro 7840sn/ 2x16gb 5600c40/ 4060/ stock 1tb-os/ 4tb sn850x
    CPU
    10900k & 9940x & 5930k
    Motherboard
    z490-Apex & x299-Apex & x99-Sabertooth
    Memory
    Trident-Z Royal 4000c16 2x16gb & Trident-Z 3600c16 4x8gb & 3200c14 4x8gb
    Graphics Card(s)
    Titan Xp & 1080ti FTW3 & evga 980ti gaming
    Sound Card
    Onboard Realtek x3
    Monitor(s) Displays
    1-AOC G2460PG 24"G-Sync 144Hz/ 2nd 1-ASUS VG248QE 24"/ 3rd LG 43" series
    Screen Resolution
    1920-1080 not sure what the t.v is besides 43" class scales from 1920-1080 perfectly
    Hard Drives
    2-WD-sn850x 4tb/ 970evo+500gb/ 980 pro 2tb.
    PSU
    1000p2 & 1200p2 & 850p2
    Case
    D450 x2 & 1 Test bench in cherry Entertainment center
    Cooling
    Custom water loops x3 with 2x mora 360mm rads only 980ti gaming air cooled
    Keyboard
    G710+x3
    Mouse
    Redragon x3
    Internet Speed
    xfinity gigabyte
    Browser
    Firefox
    Antivirus
    mbam pro

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