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Increasing VCore vs. Enabling Load Line Calibration

post #1 of 11
Thread Starter 
What's the difference between the two?

My board has about 0.05V Vdrop, so when I set VCore to 1.37V in BIOS it will show as around 1.32V under 100% load in LinX.

So my question is, if my system is stable with the VCore set to 1.37 in BIOS (meaning it's stable at 1.32 with the Vdrop factored in), then is there a need to enable load line calibration and lower the VCore set in BIOS? I could enable it and set the VCore in BIOS to 1.32, which would still give me a VCore of 1.32 under 100% load since LLC is on, but what advantage does that bring?

With LLC on, isn't the motherboard just feeding the CPU more VCore anyway to "cancel out" the VDrop?

I should also add that even with my Vcore set to 1.37v and LLC off, the actual VCore in Windows never goes beyond 1.32 or so because I have speedstep and dynamic vcore enabled. So when the CPU is not under load, the VCore is very low, and when it is under 100% load, VDrop ensures it never goes beyond about 1.32v. So for all practical purposes, can I consider the VCore to be 1.32v, or would it still be 1.37v?
Edited by 996gt2 - 6/4/11 at 11:23am
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post #2 of 11
WHen your system is under load the vcore drops, this is called vdroop.

The difference in the vcore of the BIOS and windows is called vdrop

LLC eliminates Vdroop as far as I know. When your CPU is under load the vcore decreases under normal conditions to prevent stress on the VRM's acc to Intel's Spec.

Enabling LLC eliminates this problem and gives more overclocking headroom.

If your system is stable at 1.37 ,I would recommend keeping LLC off, since you're no where close to dangerous vcore settings biggrin.gif

Just enable LLC at high vcore settings to prevent high idling voltages smile.gif
Edited by chip94 - 6/4/11 at 11:49am
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post #3 of 11
Yes, but as far as I know, it spikes the voltage REALLY high at some point.
I think someone once said that it's not Vdroop that's the problem, it's LLC.
Ninja, this here http://www.overclock.net/intel-cpus/657317-vdroop-not-llc-poll.html
    
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post #4 of 11
Quote:
Originally Posted by Skiivari;13750310 
Yes, but as far as I know, it spikes the voltage REALLY high at some point.
I think someone once said that it's not Vdroop that's the problem, it's LLC.
Ninja, this here http://www.overclock.net/intel-cpus/657317-vdroop-not-llc-poll.html

You're right about the spiking. But there are hardly any CPU that have died because of LLC. i.e No concrete evidence.

Plus, the spike is so fast that you cant even register it. I've been using LLC for over a year now on many of my computers at 1.4v + and nothing has happened. Just my two cents smile.gif

But it even depends on the mobo.
I've got GIGABYTES with LLC running at ease. I think the ASUS's have a glitch with LLC. THey both work differently.
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post #5 of 11
it really depends on the amount of LLC used, for example, I have set LLC on mine at ultra high which keeps the voltage lower than what is set in the bios, under load it is still lower than what is set in the bios, however if I go onto using extremem LLC my voltage spikes quite a bit. Giagbyte mobo's I think have a 10 level LLC setting. As long as the voltage is lower than what is set in the bios then your fine.
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post #6 of 11
Vdroop is a technology that manufacturers build into their motherboards on purpose... it's not a flaw or sign of bad engineering.

When a cpu changes speeds or load states, it does so instantly. However, the VRMs on your motherboard (they supply your cpu with voltage and amperage) can't adjust their power output as fast. If we gloss over all of the technical details, it means that, for a fraction of a second, your cpu isn't getting the proper voltage and/or wattage, which can lead to instability or potential damage.

Vdroop protects the cpu during speed/load changes by artificially raising the vcore during mixed-loads and transitions between high and low loads. Turning LLC on (or Vdroop off, depending on what your BIOS calls it) disables this feature so that your vcore will always be what is set in the BIOS.
 
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post #7 of 11
Thread Starter 
Quote:
Originally Posted by munaim1;13750393 
it really depends on the amount of LLC used, for example, I have set LLC on mine at ultra high which keeps the voltage lower than what is set in the bios, under load it is still lower than what is set in the bios, however if I go onto using extremem LLC my voltage spikes quite a bit. Giagbyte mobo's I think have a 10 level LLC setting. As long as the voltage is lower than what is set in the bios then your fine.

Is there any difference between that and just increasing my VCore in BIOS without LLC enabled?

I mean, if I have my VCore set to 1.37 in BIOS and my actual VCore under 100% load never goes beyond 1.32V or so, that's not exactly a problem, is it?
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post #8 of 11
Quote:
Originally Posted by 996gt2;13750584 
Is there any difference between that and just increasing my VCore in BIOS without LLC enabled?

I mean, if I have my VCore set to 1.37 in BIOS and my actual VCore under 100% load never goes beyond 1.32V or so, that's not exactly a problem, is it?

Nope,You're good to go.
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post #9 of 11
Quote:
Originally Posted by 996gt2;13750584 
Is there any difference between that and just increasing my VCore in BIOS without LLC enabled?

I mean, if I have my VCore set to 1.37 in BIOS and my actual VCore under 100% load never goes beyond 1.32V or so, that's not exactly a problem, is it?
Just higher temps. I've been using LLC and it gives the processor a voltage boost when you should have it, and not a permanent one, which would lead into higher temps.
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post #10 of 11
Thread Starter 
Quote:
Originally Posted by Starbomba;13750670 
Just higher temps. I've been using LLC and it gives the processor a voltage boost when you should have it, and not a permanent one, which would lead into higher temps.

I have dynamic VCore enabled as well as Speedstep, so when my CPU is idling it is using something like 0.96V at 1.6 GHz.

At 100% load, the Vdroop means my CPU never reaches beyond 1.32V in Windows (under Prime95 or LinX), even though I set the VCore to 1.37V in BIOS with LLC disabled.

So, I'm confused why situation 1:
1) Setting VCore in BIOS to 1.32V but enabling LLC.

Would give me lower temps than situation 2:
2) Setting VCore at 1.37V in BIOS but disabling LLC.

In both cases, wouldn't the max VCore at 100% load in Windows still be 1.32V? And when the CPU is not at 100% load dynamic VCore and Speedstep would bring down the Vcore to under 1.0V anyway.

So what's the benefit of LLC here? With the possibility of having VCore spikes with LLC enabled, it seems like disabling LLC and just setting the VCore to 1.37V would be the better thing to do.
Edited by 996gt2 - 6/4/11 at 2:32pm
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