Originally Posted by Iglesias
What is offset, is that Vdroop?
I just realized that I'm using a different offset value now, so I will speak as though I am back in time before I changed it:
Offset is where the motherboard sets the voltage based on the current VID (every multiplier has its own VID). So, I have my motherboard adding 0.005V to my VID which results in 1.368V under full load (while running Prime95). The Load-Line Calibration setting affects this too, and I have that set to Ultra High which, for me, results in the least amount of vDroop possible. If I were to use Medium, or High, then I'd have more vDroop which would result in a lower core voltage under full load (lower than 1.368V) without adjusting the offset voltage to compensate. I also have C3 and C6 disabled because if they're enabled, then I get random lock-ups or BSODs while idling, although they're very infrequent.
Now, let's jump ahead to today. I am unable to remember my current settings, so I can go into my UEFI BIOS to check, but the main difference I want to point out is that I discovered that if I use a lower Load-Line Calibration of High instead of Ultra High, then I can have C3 and C6 enabled without any problems. This also means that I have to use a different offset in order to compensate for the increased vDroop. So, I think that I'm using +0.065V now, but it could be +0.070V. Either way, this shows how much more vDroop I get by changing my Load-Line Calibration setting by one increment.
In other words: no, Offset has nothing to do with vDroop. However, you have to take vDroop into account in order to know where to set it in order to achieve a desired outcome (a desired core voltage). The secret is to start with a Manua/Fixed voltage and find the setting for your LLC (Load-Line Calibration) that results in the smallest amount of vDroop, which is when the voltage droops under full load. The smaller the amount of vDroop, the better. Get it down as small as you can without resulting in vRise, which is where the voltage would go up upon full load.
Once you figure out the best LLC setting for the least amount of vDroop, let it idle and take note of that idle voltage. Then, find the VID for your full-load multiplier, which is x47 for me. Again, every multiplier has its own VID. So, open both Prime95 and Core Temp. Start Prime95 and then look at the VID in Core Temp. Next, find the mathematical difference between that VID and your idle voltage. This mathematical difference is what your Offset should be, although you'll have to round it to the nearest 0.005V increment. So then, you would go into the BIOS to set the Offset to that mathematical difference rounded to the nearest 0.005V increment. Then, you'd go back into Windows and check your full load voltage in CPU-Z by having both CPU-Z and Prime95 open. You'd run Prime95 and watch the core voltage in CPU-Z. If it's not where you want it, then re-adjust the Offset some more. If readjusting the offset doesn't result in the voltage you want while running Prime95, then you can use an Offset setting that might result in a slightly higher core voltage than you were after. It's better to be a hair too high than a hair too low.
Originally Posted by Iglesias
And is that the lowest voltage that's stable with 4.7?
I think so, but don't go by my settings. No two CPUs are identical.