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  1. #1
    ROG Guru: Yellow Belt Array Zeroed85 PC Specs
    Zeroed85 PC Specs
    MotherboardAsus Maximus XIII Hero - Z590
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    XII Hero + 10900K manual override down volting under load.

    I'm seeing strange behavior running the 10900K in manual override mode with the XIII Hero. When I apply load to the CPU (such as Cinebench) the CPU down volts (according to HWiNFO). The voltage reading in CPU-Z is at odds with HWiNFO. When the CPU becomes idle again the voltage swings back to the manual override voltage I have set in the BIOS. I cannot figure out what is going on.

    Click image for larger version. 

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    Last edited by Zeroed85; 04-13-2021 at 07:34 AM.

  2. #2
    ROG Enthusiast Array EncodeGR PC Specs
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    MotherboardAsus ROG Maximus XIII Hero
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    Quote Originally Posted by Zeroed85 View Post
    I'm seeing strange behavior running the 10900K in manual override mode with the XIII Hero. When I apply load to the CPU (such as Cinebench) the CPU down volts (according to HWiNFO). The voltage reading in CPU-Z is at odds with HWiNFO. When the CPU becomes idle again the voltage swings back to the manual override voltage I have set in the BIOS. I cannot figure out what is going on.
    Yes, that is the expected behaviour, it's what's called "VDroop".
    The voltage drops while transitioning from "idle" to "under load". The lower your LLC (Load Line Calibration) setting is, the more VDroop you will have.

    As long as you don't have any crazy drops or spikes and your CPU runs stable you don't need to worry about it. But that needs testing.
    Otherwise, by increasing the LLC, you reduced those fluctuations, resulting in lower Vdroop and spikes, but your voltage will be higher overall.

    Check the video below, it should answer all your questions:
    https://www.youtube.com/watch?v=NMIh8dTdJwI

  3. #3
    ROG Guru: Yellow Belt Array Zeroed85 PC Specs
    Zeroed85 PC Specs
    MotherboardAsus Maximus XIII Hero - Z590
    ProcessorIntel i9 10900K 5.1Ghz - custom cooled
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    Quote Originally Posted by EncodeGR View Post
    Yes, that is the expected behaviour, it's what's called "VDroop".
    The voltage drops while transitioning from "idle" to "under load". The lower your LLC (Load Line Calibration) setting is, the more VDroop you will have.

    As long as you don't have any crazy drops or spikes and your CPU runs stable you don't need to worry about it. But that needs testing.
    Otherwise, by increasing the LLC, you reduced those fluctuations, resulting in lower Vdroop and spikes, but your voltage will be higher overall.

    Check the video below, it should answer all your questions:
    https://www.youtube.com/watch?v=NMIh8dTdJwI
    1.172V isn't a crazy drop? In the screenshot it's at 1.172V (5Ghz all core) running Cinebench R23... The average is 1.20V. This is with an LLC of 5... Asus Realbench is generating Cache L0 errors. So what do I do here? Increase LLC or the manual Vcore?

    Why is CPU-Z not reporting the Vdroop like HWiNFO is? The voltage reading in CPU-Z is remaining static.
    Last edited by Zeroed85; 04-13-2021 at 08:19 AM.

  4. #4
    ROG Guru: Yellow Belt Array Zeroed85 PC Specs
    Zeroed85 PC Specs
    MotherboardAsus Maximus XIII Hero - Z590
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    Here is the system idle, no CPU load, Windows balanced power plan. HWiNFO reads 1.288V (current) while CPU-Z reads 1.439V. The manual override I've set in the BIOS is 1.300V. So why is CPU-Z reporting 1.439V? Which program is reporting the correct voltage??

    Click image for larger version. 

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  5. #5
    Administrator Array Silent Scone@ROG's Avatar
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    The reported voltage will differ depending on the monitoring tool and whether VID is being reported or vcore. The VID is the voltage the CPU thinks it's receiving, Vcore is the real-time measurement. It's always preferable to increase Vcore rather than LLC when dialling in stability.

    Cinebench is fairly current intensive hence the amount of vdroop present. Vcore monitoring on ASUS boards uses die sense which is a closer more accurate measuring point for CPU voltages under high current loads where impedances and resistance is present.
    Last edited by Silent Scone@ROG; 04-13-2021 at 08:45 AM.

  6. #6
    ROG Guru: Yellow Belt Array Zeroed85 PC Specs
    Zeroed85 PC Specs
    MotherboardAsus Maximus XIII Hero - Z590
    ProcessorIntel i9 10900K 5.1Ghz - custom cooled
    Memory (part number)Dominator Platinum RGB 32GB 3800Mhz (OC)
    Graphics Card #1EVGA RTX 2080 Ti FTW3 - watercooled
    Sound CardSoundBlaster X AE-5
    MonitorAsus ROG PG349Q 34"
    Storage #1Samsung 850, 860 Evo x 2, Adata SX8200 Pro 1TB
    CPU CoolerCustom cooling, EK PE 360, Corsair XR5 280 rads
    CasePhanteks Eclipse P600S
    Power SupplySeasonic Prime 1300W
    Keyboard Corsair K70 MK.2 SE
    Mouse Corsair Dark Core Pro wireless
    Headset Hifiman HE400i
    OS Win 10 Pro 64bit 20H2
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    Quote Originally Posted by Silent Scone@ROG View Post
    The reported voltage will differ depending on the monitoring tool and whether VID is being reported or vcore. The VID is the voltage the CPU thinks it's receiving, Vcore is the real-time measurement. It's always preferable to increase Vcore rather than LLC when dialling in stability.

    Cinebench is fairly current intensive hence the amount of vdroop present. Vcore monitoring on ASUS boards uses die sense which is a closer more accurate measuring point for CPU voltages under high current loads where impedances and resistance is present.
    If SVID is disabled in the BIOS will only vcore be reported or can software still detect SVID? I have SVID disabled which is making me curious as to why HWiNFO and CPU-Z report different voltages. I have the BIOS set to report die sense.

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