I think that none do. You need to open the CPU case, as there is no way that
a program can "read" about the power supply info (at most, the chipset
provides access to temperatures/voltages and fan speeds).
Is there any software that can tell me what size power supply is in my
PC?
If you're lucky, there will be a label on the back of the case somewhere
"xxx Watts".
If not, open the case, it will be on a label on the PSU box.
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