The CPU needs stable voltage too, and that's where Load Line Calibration comes in. Some motherboards are well known to be better/worse than others, and the mileage always varies a little when overclocking. That's why I used the word might
. AnandTech was looking at ASUS' implementation with C2Qs. My GIGABYTE P35 boards don't have a LLC option, and they have horrible Vdroop issues. The only way to compensate is to raise the CPU Vcore, or risk a pencil mod. Idle Vcore always looks crazy and it definitely hinders overclocking.
We're working with GIGABYTE's implementation with Core i7 CPUs here, and it's normal for them to be "in a condition in which the CPU voltage under load is higher than the idle voltage." My stock i7 860 Vcore is 1.156 and it was jumping up over 1.3 with Prime95 running. That's with all of the default settings on a P55-DS3R. Manually setting the CPU Vcore and disabling Intel (R) Turbo Boost Tech helps a lot, but we can still see it here (1.312-1.328).
LLC is disabled too! My i7 920 does about the same on my X58-DS3R.
Load line droop is an inherent part of Intel's power delivery design. Droop can help to reduce the output-voltage spike that results from fast load/current demand changes.
But in some situations, this will limit users ability to overclock their processor. In the GIGABYTE X58 Series BIOS, users can turn on and off this setting in order to control the load line drooping. This is called Load Line calibration. With this feature turned on, it will automatically fix the processor's vcore droop issue, and ensure the processor receives stable voltage during overclocking.
I trust GIGABYTE a lot more than an old AnandTech article, and I've seen it work. My i7 920 system was having problems F@H 24/7. I spent weeks troubleshooting (mostly voltage settings), and I couldn't figure it out. I decided to enable LLC and all is well. I was able to lower the CPU Vcore too! Now the idle Vcore is less, the load Vcore is about the same, and the system has been running great. LLC isn't something I'm going to enable by default, but it's definitely something I'm going to play with, and pay more attention to in the future.