asus p4g8x deluxe/low voltage problem

[perplexed]

i have been hearing for a while a"morse code"coming from my box when i load some good grafics or a game.today i discovered that 3.3 voltage drops below 3.0 when i load a game and that sets of those little beeps.how to fix? is that voltage adjustable? do i need a new power supply? thanx in advance, jim