It's not the wattage of your PSU that matters the most, it's the brand. A 400w should get the job done if you have a quality PSU, but RAIDMAX and POWMAX PSU's might have issues with it, even if they're 400w.
What kind of PSU do you have?
-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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