The Stilt posted this info on OCN regarding LLC on C6H, this one is also good information.
Then Raja@Asus also did some oscilloscope tests, see this post, then in this post he states the same thing as The Stilt on "voltage point".
Then a member did some testing of ProbeIt point vs Socket using DMM (which will not show under/overshoot like oscilloscope). The conclusion was drawn that CPU Core Voltage (SVI2 TFN) in HWiNFO is ~ what CPU get, but again as SW and slow read, accuracy is a factor IMO. So I use as "ballpark".