Help with wattage calculations

I checked out some of the wattage calculating sites but found that the info is a bit dated, nothing on dual core processors, or the newest line of graphics cards. I want to build a computer with an X2 3800 and a 7800GT could anyone tell me what their respective wattage consumption is, or a site that has a more recent wattage calculator?
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More about help wattage calculations
  1. cant give u a site, but anything over 350 watts outa do fine
  2. Silent PC Review measured the power consumption of several computers and published detailed results:

    www.silentpcreview.com/article265-page1.html

    They agree with DeathwingX, but while some power supplies can't put out even half their rated power, especially inside a 35 Celcius computer case.
  3. Probably the best calculator out there is this one.

    http://extreme.outervision.com/index.jsp

    most up to date IMO.
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