psu 12volt query

acording to asusprobe lowest my 12v goes is 11.74 whilst running intensive games like fear and cod
my 5v stays very close to 5 again with same games

looks like its not a power issue then

back to sqaure one :(
 
how exactly do i test with a multimeter?
i can get hold of my dads but wouldnt know how to test my psu
(hes a plumber and checks for live wires under floor boards so wouldnt know how to test a psu with it)
 
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