A PS too small shouldn't "fry" anything... it will just do weird toejam.
I'd go with it as is and upgrade if you need to.
BTW, the Athlon sucks much more juice than the P3, so it's more of a concern with the Athlon. However, the V5 has a separate 4-pin power connector instead of using the AGP bus power, so I suspect it will be more tolerant than runnign a GeForce2 would be in the same setup.
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Lephturn - Chief Trainer
A member of The Flying Pigs
http://www.flyingpigs.com "A pig is a jolly companion, Boar, sow, barrow, or gilt --
A pig is a pal, who'll boost your morale, Though mountains may topple and tilt.
When they've blackballed, bamboozled, and burned you, When they've turned on you, Tory and Whig,
Though you may be thrown over by Tabby and Rover, You'll never go wrong with a pig, a pig,
You'll never go wrong with a pig!" -- Thomas Pynchon, "Gravity's Rainbow"