I can speak for GIGA boards. And their LLCs were crap! At least compared to ASUS'. And at least on my crappy UD3 rev 3. But heard the same things going on with UD3 rev 4 as well.
LLC on mine works by adding some offsets to my given Voltages. Aside from the fact that Voltages were on offset mode rather than Actual Numerical Values.
Why I said they were crap is that any LLC setting I use will give me the same HUGE VOLTAGE DELTA. More than 0.100 Volts from Minimum to Maximum. You can't even turn it off.
And the worst, LLC kicking in means your voltages would stay at around 0.070 Volts higher than my calculated Vcore considering my stock VID plus the offset.
In short, my board is running my chip hotter than it could've had on an Asus board.