Well, running the memory past 333MHz shouldn't be a problem at all when overclocking if its rated at DDR400.
What will be stressed is your chipset. If it's the same as AMD, then running RAM and FSB is best at 1:1 ratio. So since your BOARD maxes out at 333MHz, pushing past that might stress your chipset if it's staying in sync with your DDR.
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Compaq Presario V5000 laptop