utlity to detect power supply in pc?

Dsawan, just open your case and eyeball the unit. Its easy to see, unless you have some unconventional configuration inside that somehow hides the PSU. If its like most, the unit should have all the specs -- including wattage -- printed on its casing. Its the big square box -- up top or on the bottom -- with all the cables and wires attached to it.
 
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