if u don't eat food full. then you will be weak. the weakness doesn't shows immediately but going on improper diet every day for a year you will be very weak and your health is vulnerable. it is applicable to the psu and mobo too.
do want to know how.
as i mentioned the random below $20 psu's (iball,etc.,) are actually supplies only 280 to 320 watt but labels as 450 or 600 watt. when he plays games for more than 1 hour the problems starts. the psu pulls from the source more current. and fails to deliver the required wattage. so the mobo will struggles to supply the demand. this leads to hardware failure.
hope u understood.