The PSU output is transformed and regulated on the mobo itself to feed the CPU.
It's pumping the 5V and 12V lines - thats why modding the vcore will stress those lines.
The 12V line is commonly sollicited to power modern CPUs and GPUs, because transporting high currents with 12V is way more efficient than doing so with 5V.
Thats why by modding the vcore *directly* to 2.2 he may have produced a fatal overload, which is fatal with an unprotected PSU.
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