Cathar
Thanks for additional data - the more the merrier.
There is surprisingly little presented over a range of mhz and v-core - maybe shows up too many anomalies.
As you rightly indicate it can become "messy" and have not updated plot with last data point.
Maybe a range of MHz at const V-core and range of v-core at const mhz would be enlightening .
Have dug up one limited set of results: