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Load Line Calibration

post #1 of 4
Thread Starter 
To use this feature or not to use this feature. That is the question.

I'm really unsure about enabling this feature. I've heard bad things about it; causing voltage spikes, killing CPUs quickly etc etc. Is it really a good thing to use when overclocking? I could probably add another 400mhz while keeping under 1.4v with it on.. but I don't see many people having it enabled.

Basically, are LLC death stories and that all myths? Have any of you had it enabled for more than a year and gained a good overclock with it? Apart from the higher temperatures.. is there any reason not to use it?

Thanks.
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post #2 of 4
Its gennerally unneeded unless you plan to run Prime 95 for the rest of eternity
    
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post #3 of 4
I have LLC disabled. There's that one article from Anantech on LLC, but OCN members' AyeYo's, Sin0822's and INGRAMLI's thoughts on LLC really stick to me from other countless threads on LLC.
Quote:
Originally Posted by AyeYo;8945725 
LLC is really you just fooling yourself into thinking you're running less voltage. Think of it like this...

With LLC disabled, you set BIOS voltage to what you feel to be safe, 1.36v. You then fire up Prime, voltage drops to, say, 1.32v... and you fail Prime.

You then enable LLC, BIOS voltage is still set to 1.36v. You fire up, Prime and voltage doesn't drop (it stays at 1.36v, on some boards maybe it even goes up to 1.40v)... and you pass Prime.


You incorrectly conclude that LLC stabilized your overclock. But what's really happening here? The reality of the matter is that your overclock needs 1.36v under load to be stable. LLC gives you 1.36v under load with a BIOS set voltage of 1.36v. If you wanted 1.36v under load with LLC disabled, you'd need to up BIOS voltage to maybe 1.39v. So it takes more voltage to stabilize your overclock that way, right? Wrong.

With LLC disabled, the voltage you set in the BIOS is the ABSOLUTE MAXIMUM your CPU will see on that high-load to low-load spike. It is NOT the running voltage of your CPU.

With LLC enabled, the voltage you set in the BIOS is NOT the absolute maximum your CPU will see on that spike - it is the voltage your CPU will see under load. This means that when your CPU encounters the high to low load voltage spike, it's going to overshoot your BIOS set voltage by quite a bit (as can be seen in the graph from Anandtech). This means your CPU ends up seeing HIGHER voltage than it does with LLC disabled... you just don't know about it.

LLC boils down to, out of sight, out of mind. Disabling it and raising your BIOS voltage until you are stable is simply letting you see just how much voltage your CPU is really seeing with LLC on.

Hope that made sense... I suck at explaining stuff...

-> http://www.overclock.net/intel-cpus/657317-vdroop-not-llc-poll-6.html
Quote:
Originally Posted by INGRAMLI;9438901 
From what i read from the graph of vdroop/vdrop on/off, it indicated that LLC in fact did not eliminate the vdroop at first place, it only bumps it up to the original idle level AFTER it has dropped, but instability can happens no matter how short period the voltage has stayed in the lowest level (maximum negative offshoot), and the attempt to bring the voltage back to the orginal (idle) level also increase the maximum voltage hit when the loading level decrease from peak to idle......

In short, i dont see any reason to use LLC, as it did not eliminate the instability resulted from vdroop, even worse, it increased the voltage fluctuation (the delta of min/max voltage), meaning a higher maximum voltage hit to maintain the stability.......The only valid reason to have LLC on IMHO is when extreme OCing, the maximum Vcore setting available in BIOS is simply not enough, where LLC may be the last resort, but otherwise i would keep it OFF.

-> http://www.overclock.net/intel-cpus/657317-vdroop-not-llc-poll-8.html

And there's was Sin0822's thought which I totally concur that LLC should be used for extreme instances.
Quote:
Originally Posted by Sin0822;11137901 
well that exactly what i think, but LLC per platform and per manufacturer seems to be different, thats why i did this for gigabyte i wanted to see what th difference between the settings were, and low and behold there is a great difference. I didn't make this thread to tell people to use LLC or not, i actually tend to not advise using it, and just use a higher vcore. There are millions of threads out there on whether LLC is safe or not, and i have stated as before that LLC shouldn't be used for 24/7 settings, other than extreme max overclocks, where you need stability in voltage and don't want to kill the chip just for now.

-> http://www.overclock.net/intel-motherboards/846439-x58a-series-3-level-llc-examined-2.html
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post #4 of 4
honestly if its an older(P45) board i wouldn't use it, but the newer boards (x58-p67)seem to be just fine. Most newer boards have different levels like 0%,50%,100% or level1,2, and standard,or even more levels, the ones in between are fine. Higher levels of LLC can cause the voltage to actually rise during load which isn't that great for teh CPU and can cause it to degrade faster.

Lol thanks for quoting me.
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