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relationship between disabled LLC and Oc

post #1 of 8
Thread Starter 
So this is first for me, After reading couple of threads on here for LLC enable and disable, I disabled it and temp dropped by 10deg under prime 95 small FFT.

furthermore, Cpu OC the same clock with much lower voltage????
does this make sense?

I set my voltage in bios to 1.45 but in cpuz it shows 1.38 and in bios too for some reason other than the input 1.45.

my exact setup in sig.
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post #2 of 8
What you are experiencing is v-droop. With LLC disabled the vcore will drop when under load, that is why you are seeing 1.38v when you have it set to 1.45v. This can lead to unstable overclocks because the voltage under load is not what you set it to in the BIOS. This is also why you are seeing lower temperatures (lower vcore = lower temps).

When overclocking you should enable LLC so that the voltage while under load is approximately what you set it to in the BIOS. This will make it easier to set the correct voltages in the BIOS for your desired overclock.
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post #3 of 8
Quote:
Originally Posted by HobieCat;12127736 
What you are experiencing is v-droop. With LLC disabled the vcore will drop when under load, that is why you are seeing 1.38v when you have it set to 1.45v. This can lead to unstable overclocks because the voltage under load is not what you set it to in the BIOS. This is also why you are seeing lower temperatures (lower vcore = lower temps).

When overclocking you should enable LLC so that the voltage while under load is approximately what you set it to in the BIOS. This will make it easier to set the correct voltages in the BIOS for your desired overclock.

My motherboard (Asus M4A78T-E) doesn't have any LLC setting that I can see. In CPU-Z and AMD Overdrive, the voltage doesn't change at all, even under load. Why?
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post #4 of 8
Quote:
Originally Posted by Frogging101;12127776 
My motherboard (Asus M4A78T-E) doesn't have any LLC setting that I can see. In CPU-Z and AMD Overdrive, the voltage doesn't change at all, even under load. Why?

My motherboard is the same way. The is no specific LLC setting, but as long as I disable all power saving features I don't see any v-droop, so it must be built into the motherboard some how.
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post #5 of 8
Vdroop is part of AMD and INTEL design.

By enabling LLC all you're really doing is increasing the voltage without increasing the voltage.

Say you set it for 1.5v but it loads at 1.42v without LLC.

Now say you enable low level LLC and now your load is 1.475v.

Your real vcore is now higher than 1.5v. LLC adds nothing more voltage doesn't do, it just makes you feel better because you think your voltage is lower than it really is.
    
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post #6 of 8
Thread Starter 
Quote:
Originally Posted by BallaTheFeared;12128038 
Vdroop is part of AMD and INTEL design.

By enabling LLC all you're really doing is increasing the voltage without increasing the voltage.

Say you set it for 1.5v but it loads at 1.42v without LLC.

Now say you enable low level LLC and now your load is 1.475v.

Your real vcore is now higher than 1.5v. LLC adds nothing more voltage doesn't do, it just makes you feel better because you think your voltage is lower than it really is.

yeah I read mixed opinions and advices. I'll see how stable it is without LLC
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post #7 of 8
Quote:
Originally Posted by mekaw;12127246 
So this is first for me, After reading couple of threads on here for LLC enable and disable, I disabled it and temp dropped by 10deg under prime 95 small FFT.

furthermore, Cpu OC the same clock with much lower voltage????
does this make sense?

I set my voltage in bios to 1.45 but in cpuz it shows 1.38 and in bios too for some reason other than the input 1.45.

my exact setup in sig.

If you are stable using
1.45V(BIOS)...1.38V(full load)...LLC-disable

you suppose to be stable using
1.33-1.35V(BIOS).......LLC-Enable
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post #8 of 8
Either way you'll be using nearly the same voltage in the end.

LLC is just a teddy bear for all the small children to feel safe.
    
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