You'll need to upgrade definitely. The GeForce FX 5900 Ultra *requires* a 350w PSU or higher. With those components, you could probably get away with a cheapy 350 or 400w. The FX 5900 Ultra does use its own molex connector, so make sure your new PSU has enough!
-Lasereth
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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