This would sound like the (possibly OC) Turbo Boost is being activated, and it typically heavily ramps up voltage, in specific cases (G752VS had such a Turbo Gear configuration for some time) from 0.67 to 1.4+, and anything around 1.4 V heats up the CPU very quickly and to very high temperatures, unless the fan is locked at max RPM or custom cooling solutions are used. Perhaps that is the case here.
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