This thread sure became full of all kinds of fail.
The notion that LLC is a static pre-existing lookup table/algorithm based on predefined and characterized load/unload patterns is 100% hogwash.
The argument that transients do not exist in an LLC enabled system is simply uneducated BS.
Voltage transients exist in all systems with non-zero capacitance, you can't blithely discard Maxwell's equations.
To create an
effective pre-compensation algorithm for LLC as suggested here you would need to have extremely tight distribution of components characteristics for all your VRM's and power distribution components on the motherboard, and you'd need to know exactly how every CPU at any frequency and VID (i.e. all variation in those power distributions) characterized in advanced and factored into the algorithm.
It would get even more challenging once Ohm's law is accounted for and we realize the capacitance and power-draw is temperature dependent as the resistance of the system changes based on its operating temperature. Again to accomplish what is being posited here the mobo manufacturers would also need to pre-compensate for IR drop as a function of temperature as R is a function of temperature.
Think about that for a moment, to pre-compensate in the manner necessary to accomplish what has been posited above you would need to characterize all the power distribution and control components on the PSU, on the motherboard, and in the CPU for every possible VID/GHz combination for every CPU that would be manufactured (capacitance is CPU variation dependent) in addition to its specific IR drop characteristics dependant on the operating temperature and cooling/heating parameters. If the CPU cools to quickly in going from loaded to unloaded then the IR drop will decrease faster than you expected and your pre-compensating LLC will overvolt the chip temporarily (i.e. voltage transient).
The challenge to do this would be mammoth in all metrics. Which is why it is simply not done in practice.
Load line calibration is nothing new or special, it is a pre-existing technique called
dampening.
http://en.wikipedia.org/wiki/Overshoot In fact on my Asus board you won't find a BIOS option for enabled LLC, instead you find an option to toggle "CPU Voltage Dampening".
Dampening suppresses transients but does not eliminate them, it shrinks the time-domain over which they exist but it can never make them become zero. Now we can convince ourselves they are zero by limiting ourselves to collecting data with a measurement system which fails to have a sufficient sampling rate as needed to capture the voltage oscillations in the time domain for which they exist.
CPU-z is not going to capture voltage transients that exist for less than 1/8192 of a second (typical max clock resolution for software access on a PC). You would need the proper equipment (I used Keithley o-scopes in grad school, they worked on the nanosecond time regime just fine and did not cost too much) to generate the data. An absence of data does not a theory prove.
And as for the comments regarding "real engineers"...I am a real engineer and the volume of information that someone here needs to become familiar with in order to understand the ignorance on display here would fill books. Seriously, for starters they would do well to flip thru
Automatic Control Systems by Kuo and Golnaraghi and come to terms with how passive vs. active electrical control systems are implemented in reality and (perhaps more importantly) why they
have to be implemented in such manner owing to the constraints of physics and Maxwell's equations governing the characteristics of electrical systems.