I suspect the rule is true, but has to be approached from 2 directions.
I *expect* that all 6.5GHz+ chips do 5GHz at 1.275-1.30v?
But not all chips that do 5GHz at 1.275-1.30v? will do 6.5GHz+
SoF.... your 5.8GHz Vs 6.5GHz comment.... what settings for that 5.8GHz?
HWB community needs a more rigid binning "procedure" if we are going to learn anything. People are using different voltages, different benchmarks, "cascade" means -80 to -105 and these chips are temperature sensitive, we all know that. # Cores enabled?
The framework for this is developing on HWB, but with a few more ....."rules"..... and better maintained threads, HWB can become the global go-to site for CPU batch performance info, when picking the right batch matters