Questions about Der8auer Core i9-10900K (Comet Lake) Socket 1200 - pretested @ 5.1 GHz

Yes. "On the packaging of each pre-tested CPU, we also specify the core voltage required for stable OC operation, whereby there is a tolerance range of approximately +/- 20 mV depending on the voltage supply of the mainboard used. In order to protect the silicon, however, the maximum core voltage is at most a harmless 1.3 volts." - https://www.caseking.de/en/der8auer-core-i9-10900k-comet-lake-sockel-1200-pretested-5-0-ghz-hpit-671.html

That's self-explanatory.