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What really is Vdroop, what is it used for?

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bmxjumperc
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2013/06/03 05:05:48 (permalink)
How does Vdroop work, what is it used for?
I am folding and turning Vdroop off is the only way my machine keeps from crashing but as I understand it is supposed to keep the CPU voltage from dropping?
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    SeanEJohan
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    Re:What really is Vdroop, what is it used for? 2013/06/03 05:52:44 (permalink)
    It works exactly how the word sounds. When your cpu goes into work load "lowVdroop" causes the voltage to drop less, and less frequently. What overclockers essentially want is "highVdroop", as we don't want the voltage to drop at all especially during benchmarking. Basically its for stability purposes, I run with mine on "lowVdroop" and have had better success@5.1ghz than on "auto".
     

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    HeavyHemi
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    Re:What really is Vdroop, what is it used for? 2013/06/03 21:06:15 (permalink)
    bmxjumperc

    How does Vdroop work, what is it used for?
    I am folding and turning Vdroop off is the only way my machine keeps from crashing but as I understand it is supposed to keep the CPU voltage from dropping?

    Vdroop is by design. In a nut shell, vdroop causes the CPU voltage to drop a bit under load. This is to prevent the CPU from being overvolted during sudden load changes. When a CPU transitions quickly from a heavy load to no load, there is a brief spike in voltage. Vdroop limits this to the maximum of what you have your CPU vcore set at. It's a safety feature. If you're overclocking and you're crashing under load, then you need to up your vcore. Turning Vdroop off, has the opposite effect. Your minimum CPU vcore is now what you have set and the voltage will not drop below that. It can make it easier to find a stable overclock. However, you lose the protection of vdroop and the risk of overvolting your CPU. Mostly likely if you stay under 1.4v even without vdroop, you're relatively safe.

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    SeanEJohan
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    Re:What really is Vdroop, what is it used for? 2013/06/04 07:00:48 (permalink)
    Vdroop has nothing to do with over-volt protection, it simply doesn't allow voltage to drop suddenly, that's all it does. Over-volt protection is a completely different feature.

    i5 2500k Sandy Bridge@5.0ghz@1.455Vcore
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    2 Evga 670 GTX FTW 2Gb versions@1320/3707 -1280/3707/145% power target/k-boost locked
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    G-skill Ripjaws 1600mhz memory (9-9-9-24) 4 x 4gig(16 gig)       
    Intel Cherryville 520 SSD (240gb) 
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    bmxjumperc
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    Re:What really is Vdroop, what is it used for? 2013/06/05 11:07:25 (permalink)
    Exactly my point, I don't think anyone really knows what vdroop does. The BIOS description is "keeps CPU voltage from sagging when under heavy loads".
    If I watch the voltage with CPUID it actually dips lower with vdroop "enabled".
    I just spent a good while figuring out why I would want it on and I couldn't find any reason to have it on.
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    bdary
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    Re:What really is Vdroop, what is it used for? 2013/06/05 13:10:43 (permalink)
    bmxjumperc

    Exactly my point, I don't think anyone really knows what vdroop does. The BIOS description is "keeps CPU voltage from sagging when under heavy loads".
    If I watch the voltage with CPUID it actually dips lower with vdroop "enabled".
    I just spent a good while figuring out why I would want it on and I couldn't find any reason to have it on.


    HeavyHemi's explanation of Vdroop is about as close as you can get without getting too technical.  By design, when enabled, does help protect the CPU from being overvolted when you come from a heavy CPU load to an idle state.  If you want to read Intel's technical definition, you'll find it here >>> http://www.thetechrepository.com/showthread.php?t=126


     
     
     
     
     
     
     
     
     
     
     
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    HeavyHemi
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    Re:What really is Vdroop, what is it used for? 2013/06/05 20:21:23 (permalink)
    bmxjumperc

    Exactly my point, I don't think anyone really knows what vdroop does. The BIOS description is "keeps CPU voltage from sagging when under heavy loads".
    If I watch the voltage with CPUID it actually dips lower with vdroop "enabled".
    I just spent a good while figuring out why I would want it on and I couldn't find any reason to have it on.

    Actually, some of us do. On the other hand, some BIOS vendors descriptions are inaccurate.

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    HeavyHemi
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    Re:What really is Vdroop, what is it used for? 2013/06/05 20:23:55 (permalink)
    SeanEJohan

    Vdroop has nothing to do with over-volt protection, it simply doesn't allow voltage to drop suddenly, that's all it does. Over-volt protection is a completely different feature.

    You might wish to research this if you're going to directly contradict someone and intel for that matter.

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