You should have no problems switching over. The New T-Bird/Duron's socket A require much less power than the original Athlon Slot A did. Same holds true with your GeForce2 card, which also uses less power than the original GeForce. As such, the power supply requirements have dropped to around 250w, but most have no problems even with 230w supplies, unless you plan on powering a bunch of HD or CDRoms as well.