with a setup like yours you will need at least a 300 W power supply.
if the power supply doesnt supply enough current then the system becomes unstable and you might lose either your ps or motherboard.
for info, o/ced 1G Athlon and v7700dlx (thats GeForce2 GTS w/32 MB right?) will together need more than 65 A of current at 3.3~5V. besides tere are other parts as well.
be sure to get a high capacity power supply.
<font color=blue>die-hard fans don't have heat-sinks!</font color=blue>