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Vcore fluctuates

post #1 of 11
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Is Vcore supposed to fluctuate under load? mine does CnQ is disabled BTW
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post #2 of 11
I believe so, it's called a "vDroop".
post #3 of 11
Yes vCore does fluctuate under load, it's vDrop or vDroop and I forget which is which.

If you have an option in your bios called LLC or any "low" option for vDrop/Droop turn that on.
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post #4 of 11
Yep, I think it is vDroop. On my EVGA board, with vDroop on, my vCore drops about .2V under load. So if I had it set to 1.26, it would drop to 1.24.

With vDroop off, my vCore increases underload. I have my vCore set to 1.24 right now and it raises to 1.27-1.28 under load.
post #5 of 11
If you have your Vcore setting in bios set to auto, it will fluctuate much more substantially than the scenarios described above.
post #6 of 11
Yes, it's called vDroop. For me, I set the voltage to 1.3625 and under load it dropped 1.26V. Long story short, I had to up it to 1.375 and enable LLC to get it stable.
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post #7 of 11
Vdroop, it's normal
post #8 of 11
     
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post #9 of 11
Quote:
Originally Posted by Rookie1337 View Post
The voltage set in your bios is the set Vcore, the value you see in CPUz at idle in windows is your Vcore after Vdrop. This stands for voltage drop, and is 100% normal. The value you get at load is called Vdroop, and is an inherent design characteristic to prevent overvoltage during Load to Idle transitions and vice versa. LLC is Load Line Calibration, it removes Vdroop in effect, to reduce the loss of voltage during idle to load transitions, but can allow voltage spikes above the set Vcore amount in the bios during Load to Idle transitions. This is how I understand it to work on an Intel setup.

What you have described on your AMD setup doesnt make sense. It seems that your results are the reverse of what they should be, you shouldnt be seeing a greater load voltage than idle voltage with LLC disabled, and you shouldnt be seeing .25V Vdroop with LLC 100% enabled. I appears that disabling LLC completely will give you your desired effect.

@OP hopefully my description to rookie has given you a bit of insight as well.

@Rookie I dont mind helping people, and Im glad if I have helped you out, but what you have done by "thread jacking" as they say, is somewhat frowned upon. Not upset with you or anything, just an FYI. If you have any further questions, feel free to PM me.
Edited by Mattb2e - 12/30/10 at 7:38pm
post #10 of 11
Quote:
Originally Posted by Mattb2e View Post
The voltage set in your bios is the set Vcore, the value you see in CPUz at idle in windows is your Vcore after Vdrop. This stands for voltage drop, and is 100% normal. The value you get at load is called Vdroop, and is an inherent design characteristic to prevent overvoltage during Load to Idle transitions and vice versa. LLC is Load Line Calibration, it removes Vdroop in effect, to reduce the loss of voltage during idle to load transitions, but can allow voltage spikes above the set Vcore amount in the bios during Load to Idle transitions. This is how I understand it to work on an Intel setup.

What you have described on your AMD setup doesnt make sense. It seems that your results are the reverse of what they should be, you shouldnt be seeing a greater load voltage than idle voltage with LLC disabled, and you shouldnt be seeing .25V Vdroop with LLC 100% enabled. I appears that disabling LLC completely will give you your desired effect.

@OP hopefully my description to rookie has given you a bit of insight as well.

@Rookie I dont mind helping people, and Im glad if I have helped you out, but what you have done by "thread jacking" as they say, is somewhat frowned upon. Not upset with you or anything, just an FYI. If you have any further questions, feel free to PM me.
That's the explanation I've seen just about everywhere but none really were given for AMD, only for Intel.

I wasn't thinking it was thread jacking so much as a jab to get some answers for the OP and myself. Sorry.
     
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