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Core i7 Vcore rise instead of droop

post #1 of 10
Thread Starter 
Previously, I watched the voltage drop, when CPU is heavily loaded. Now, on the contrary. At a load of CPU voltage rises. I did not notice at what point there was a change. And I did not change any settings at the BIOS for a long time, except for the frequencies and voltages.

Here are some numbers (data obtained from the OCCT Linpack test):
Code:
Core Freq. | Bus Freq. | Vcore at idle | Vcore at load
3.07Ghz    | 133MHz    | 1.160V        | 1.175V
3.85Ghz    | 160MHz    | 1.265V        | 1.289V
The voltage difference is not huge, and does not look dangerous, but I do not understand the nature of what is happening.
What does this mean? And what could be a source of the new behavior?

Thanks in advance.
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Black Tiger
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post #2 of 10
LLC kicking in probably..? Did you change any bios settings lately?
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post #3 of 10
Called Load Line Calibration.

If you disable it you'll see vdroop, and very prone to big unstability just because you disabled it.

Compensate the vcore increase with a BIOS voltage drop, just like I do
   
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post #4 of 10
Looks like the motherboard is overcompensating for the Vdroop, to stop this find the LCC option in your BIOS and put that down a notch or 2.
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post #5 of 10
Quote:
Originally Posted by Artikbot View Post
Called Load Line Calibration.

If you disable it you'll see vdroop, and very prone to big unstability just because you disabled it.

Compensate the vcore increase with a BIOS voltage drop, just like I do
Disabling LLC does not cause instability. Vdroop is a good thing.
post #6 of 10
Quote:
Originally Posted by jhaze84 View Post
Disabling LLC does not cause instability.
Say that to my motherboard.


Stable on 1.45V compensating LLC with lower vCore, 100% unstable on 1.45V without LLC, voltage dropping compensated vias increasing vcore a notch.
   
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post #7 of 10
Thread Starter 
Thanks for the replies!

I've never set up the LLC option and left it in Auto. Is it possible that the motherboard has changed the actual mode of LLC based on my actions or something else?

And while I understand the general meaning of LLC, still do not understand the proposed values in the BIOS. For example QPI LLC has only the options Auto, Disabled and Enabled. But for the CPU options differ. The choices are (excluding auto mode): 0% Calibration, 50% Calibration and Full Calibration.
It would be great if you explain the meaning of these parameters.
Edited by spacemonkey1337 - 3/20/11 at 9:35am
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Black Tiger
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post #8 of 10
i will like to know that my self
post #9 of 10
Quote:
Originally Posted by jhaze84 View Post
Disabling LLC does not cause instability. Vdroop is a good thing.
Cool Story, Bro.

I torture computers for fun. As a extreme cooler user, LLC is the best invention EVER.
post #10 of 10
Quote:
Originally Posted by Artikbot View Post
Say that to my motherboard.


Stable on 1.45V compensating LLC with lower vCore, 100% unstable on 1.45V without LLC, voltage dropping compensated vias increasing vcore a notch.
Yes that makes sense, because when LLC is off, the voltage you set in BIOS is the absolute max voltage with spikes, not target voltage.

Anyways I don't mean to start an LLC debate here. There are plenty of those threads.
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