Windows 8 and 8.1 Forums

Undervolting..

  1. #1


    Posts : 209
    Windows 8.1 (HOME not Pro) 64bit

    Undervolting..


    Just installed Intel XTU Extreme program..

    I'm so happy and scared at the same time!

    Does anybody have experience with this? 2 questions.. that's all..

    1. Is there a difference between using Intel XTU and the Windows internal power settings? (min and max CPU Usage %)
    Click image for larger version

    2. In XTU - If I only change the multipliers from like 32x to 29x core1-4 and I do not undervolt.. is that helpful whatsover?

    or do you have to both Undervolt and lower the clock speed of the cores?

    Click image for larger version

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  2. #2


    Trnava
    Posts : 683
    Win 8.1.1 Pro x64


    Quote Originally Posted by bassfacer22 View Post
    or do you have to both Undervolt and lower the clock speed of the cores?
    No, you can actually undervolt and even overclock a little, because CPU are set with the default voltage, which differs from piece to piece, but usually it is much higher than required. I have undervolted my CPU and set it 1,9GHz to 2,0GHz. Finding the proper voltage is tricky, you have to lower the voltage, until you get BSOD, then increase it and stress CPU for hours to make sure, that it is stable, if you get BSOD, then increase again, etc.
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  3. #3


    Normally you should operate the CPU at the specified voltage but when overclocking it is often necessary to increase the voltage for reliable operation. Reducing the voltage is often done to lower operating temperature and heating but you must be very careful or system instability may result. Otherwise undervolting is neither necessary or desirable.
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  4. #4


    United States
    Posts : 3,093
    Windows 8.1 Pro 64-bit


    On laptops it is taking a big chance overclocking/overvolting as the heat dissipation is designed for certain temperatures and isn't usually that great to begin with on most.

    Undervolting/underclocking isn't worth the very little payoff IMO. I'd get a water cooled desktop if you really want to mess around with clocking and voltages. Again, my opinion is all.
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  5. #5


    Trnava
    Posts : 683
    Win 8.1.1 Pro x64


    I can not imagine using a laptop without undervolting, my current one was loud with a stock voltage when idle, now it is quiet even when in use, the temperature was decreased so much, that even the best cooling pad can only envy. Benefits includes not just less heat and noise, but also prolonged battery power.
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  6. #6


    United States
    Posts : 3,093
    Windows 8.1 Pro 64-bit


    Quote Originally Posted by TairikuOkami View Post
    I can not imagine using a laptop without undervolting, my current one was loud with a stock voltage when idle, now it is quiet even when in use, the temperature was decreased so much, that even the best cooling pad can only envy. Benefits includes not just less heat and noise, but also prolonged battery power.
    I've never had a problem with fan noise or overheating on stock voltages so I suppose it depends on the laptop and what the user is doing with it. If you're able to undervolt without any issues then that is a good thing. Just not something I would recommend across the board to every user.

    If the OP wants to experiment with undervolting then I say go for it just make sure changes revert to stock upon reboot before doing anything permanent. I know most software has that fail-safe built in. I've had no need to do it personally, also my laptop stays plugged in, only draw down the battery so often to keep it healthy.
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  7. #7


    Posts : 209
    Windows 8.1 (HOME not Pro) 64bit


    well thank you guys for all the answers, but my original question kinda was - does anybody know what the power settings in windows advanced power options will do compared to INtel XTU? - like Min and Max Processor state..% - wouldn't that essentially be the same as setting the clock speed down in Intel XTU.. I mean i can't undervolt with windows power settings but i can set max cpu state to 80% (which some people say stops throttling etc..)

    my issue - I have a Lenovo Laptop that is locked down by lenovo.. i have an i7 4700mq that can't run at full speed becuase Lenovo made this laptop with strict heating restrictions and it throttles down the speed and video card and everything..

    the only solution everyone says to get full performance from the video card and cpu is to undervolt for less heat because the heat causes the lenovo energy bios settings to kick in and stop the cpu from going long periods of 3.2 mhz ..

    anyway, I have to undervolt becuase of this heating issue.. and by the way, lenovo is so "great" they even locked the fan.. so i can't use speedfan or control the fan to set it to cool my computer!

    oh and right on with your comments
    TairikuOkami !!!



    thanks for the replies guys..

    now i'm just trying to figure out about VMM in the bios.. i can turn that on or off..
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  8. #8


    Posts : 148
    Windows 8.1 Update 1


    What the Windows power settings do is the following: A modern cpu has a built in ability to downclock itself when not under heavy load. In the Windows power settings you can determine which clock speeds should be used. The extremes would be setting min and max to 100 % (thus the cpu would constantly be running at full speed) or min. and max. at the lowest possible value (which would result in the cpu only running at it's slowest clock speed).

    I don't know the Intel software (actually I'm a AMD guy) but I guess the intel settings would result in the cpu constantly running at the selected clock speed since most cpus switch off their built in power saving feature if a manual clock speed is selected. At least that's the case with AMD cpus. Honestly I recommend you not to alter the values and let Windows handle the cpu clock and use the built in power saving feature. My experience is that what you gain by overclocking/ undervolting the cpu is not worth the time you spend finding stable settings. At least on a desktop pc. But that's just my point of view.
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Undervolting..
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