A x1950 series card might run on a quality 350w PSU, though it's is pushing it alot, like the chup said, expect middle of game shut-offs and the like. More important than wattage is the 30a +12v that series of cards eats up, and I'll hazard a guess that OP's 350w PSU doesn't have close to that amount of current.
Buy a new PSU if you want a 1950 card. I'm running an X2 3800, 7600gt, 2GB RAM, 2 HDD, etc on a really generic 250w, 10a +12v PSU.(waiting on replacement) I can even play crysis, oblivion, etc fine, no shutoffs. I wouldn't thought it possible had I not seen it, so you may get lucky, but don't count on it.
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