TechyInAZ :
You just contradicted yourself. So to answer your question, it doesn't matter. Slide that slider anyway you want it is not going to change the behavior of the card whatsoever.
This is patently false. Core voltage matters a great deal on the Pascal architecture. So much so, in fact, that increasing voltage while overclocking, if temps get too warm, can cause instability. The Pascal cores are extremely sensitive to temperatures.
So while it's true that the voltage is "locked" on Pascal GPUs, boost 3.0 will usually keep the GPU from running the maximum voltage. That limitation is set at 1.093v. What you'll likely normally see for voltage on stock settings, is most likely around 1.07v or less.
For instance. On air, a GPU may be able to boost itself to say 2100, but will only need 1.053v to get there. As core temps increase, it'll need more voltage to hold that same clock. Likewise, as core temps decrease, less voltage will be required to keep that clock stable. There are limits, obviously, there's a curve, so to speak there where the GPU will work efficiently. All based around core temp, which effects the voltage required to keep a specific clock stable.
It's possible to skip around these limitations, but only slightly, by using the voltage / frequency curve to overclock, instead of using the offset method.
An example of the voltage / frequency curve method of overclocking.