We therefore asked Intel directly what voltages should ideally not be exceeded for overclocking 11th generation CPUs. The official statement from Intel on the subject is
"Intel does not publish safe OC voltages as any voltage change is considered outside of specifications. The ideal voltage to reach the maximum OC frequency for a given cooling solution does change with new architectures."
That's a general statement that doesn't provide much in the way of concrete approaches for now, but Intel added some interesting information.
"When Dan Rangland overclocks his RKL CPU at home, he usually sets the voltage to 1.45V with the AVX offsets on. The frequency is scaled across all cores, so that the maximum frequency is applied to 1-2 cores. The maximum frequency decreases with an increasing number of cores."
Dan Rangland is principal engineer in Intel's Performance Tuning and Overclocking Architecture team.