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Cpu llc?

post #1 of 41
Thread Starter 
What is CPU LLC? In this forum http://www.overclock.net/intel-cpus/...ease-read.html they either say no LLC or LLC. What's the difference between on or off? Whta does it do? thanks.
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post #2 of 41
LLC (Load Line Calibration) helps eliminate vDroop, at least that is what my motherboard says..

Most people (including me) have it enabled.
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post #3 of 41
Be warned when using LLC, especially with 45nm CPUs.

Vdroop is a design feature to ensure safe operation of the CPU. Basically loadline calibration defeats the purpose of vdroop. Besides the vdroop, there is also the voltage offsets (commonly called vdrop) which is the difference between bios set vcore and actual windows vcore.

Here is what is going on:

Anandtech: LLC

Here is the standard vdroop as intended:



Here is with LLC or pencil mod:


Quote:
No Vdroop means the VRM circuit must work harder at maintaining a constant voltage

In this next case we eliminate Vdroop altogether and examine the chaos that ensues. As illustrated by our model, removing Vdroop does nothing to reduce the magnitude of the idle to full-load transient but does increase the settling time as the VRM must recover to a higher final regulation voltage. As in the case of no Voffset, it is possible to exceed the maximum allowable CPU voltage (VID). Clearly, removing Vdroop gains us nothing and only serves to create problems that are more serious.

So what happens when we remove both Voffset and Vdroop? The answer is simple - bad things. Although the difference between the maximum positive and negative peak overshoot are the same, severe violations to the CPU VID limit occur. If you're asking yourself what's the problem with this, consider the case of a CPU VID of 1.60000V - because the user feels this is the absolute maximum CPU voltage that they will allow. Just how high do you think CPU voltage will go after leaving a heavy load condition? We can't be sure without knowing more of the details, but we can certainly conclude that it will be well in excess of 1.6V. If you've ever run a benchmark only to have your system crash right as it finishes then you have experienced the consequences of this poor setup.


Finally, let's take one last real-world look at the consequences of removing Vdroop. ASUS' implementation of this feature, labeled as Load Line Calibration and included with their latest line of motherboards, is particularly worthy of our attention for a number of reasons. The first is that setting lower voltages with this option enabled actually results in a condition in which the CPU voltage under load is higher than the idle voltage. Imagine our confusion as we desperately struggle to understand why our system is Prime95 stable for days yet continues to crash under absolutely no load. What's more, in spite of the absence of droop and for reasons unknown, enabling this feature artificially raises our CPU's minimum stable core voltage at 4.0GHz from 1.28V to about 1.33V. As a result, our system uses more power under load than is otherwise necessary. Our efforts to reduce our processor's supply voltage backfired - instead of lowering the system's total power consumption we managed to affect a 20W increase.
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post #4 of 41
LLC = load line calibration. It reduces your vdroop by slightly increasing the core voltage when a load is placed on the CPU. For overclocking, keep it enabled. Fluctuations in voltage can destablize an overclock. Either that, or your voltage drops too low to sustain a certain overclock - LLC will help that
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post #5 of 41
load line calibration (LLC) is used to stabilize your vcore while under full load. This feature breaks Intel Specification for a specially designed circuit called 'vdroop.' What vdroop does is lowers vcore while under load to prevent voltage irregularities and spikes. Overclockers are concerned with Load Line Calibration since, when enabled, can greatly stabilize an overclock. Without it, LLC will throttle vcore under load and cause system instability.
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post #6 of 41
Quote:
Originally Posted by jam3s View Post
load line calibration (LLC) is used to stabilize your vcore while under full load. This feature breaks Intel Specification for a specially designed circuit called 'vdroop.' What vdroop does is lowers vcore while under load to prevent voltage irregularities and spikes. Overclockers are concerned with Load Line Calibration since, when enabled, can greatly stabilize an overclock. Without it, LLC will throttle vcore under load and cause system instability.
It is not so black and white. Vdroop does not cause an unstable OC. Sure with LLC enabled, you can reach a slightly higher OC, but at a price. Vdroop just drops the vcore when the CPU is under load. As explained in my previous post (but with more wording), vdroop protects the CPU from dangerous voltages spikes which can be damaging to a 45nm core. So when you enable LLC (eliminating the vdroop) those voltage spike can reach dangerously high levels. Use it at your own disgression. I highy discourage it's use with a maxed out vcore.
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post #7 of 41
for 45nms it is advisable to disable LLC. I read that also from anandtech.
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post #8 of 41
Thread Starter 
What is vdroop? Isn't it better to have more vdrop than to let it be reduced and having increased voltage instead? And why is it bad for 45nms? Well I don't overclock.. But for stock, would I need it at load? And it is enabled from bios right? Thanks.
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post #9 of 41
the overshoot might kill your chip if it's 45nm and near maximum specified voltage
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post #10 of 41
Quote:
Originally Posted by gera229 View Post
What is vdroop? Isn't it better to have more vdrop than to let it be reduced and having increased voltage instead? And why is it bad for 45nms? Well I don't overclock.. But for stock, would I need it at load? And it is enabled from bios right? Thanks.
vdrop and vdroop are 2 different things (but often confused with each other). Vdrop is the term that describes the CPU voltage difference from what is set in bios and what the system actually uses when the OS loads. Vdroop is the voltage drop you see to the CPU when it is placed under load.

It is bad for 45nm CPUs because of their die shrink, and the fact that their tollerance for voltage is significantly less then their predecessors (65nm).
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