650W will still be overkill, when hte PC is not loaded you will only be consuming about 100W which falls well outside the efficiency curve. But it does leave room for upgrading to a quad and whatever energy siphon cards will come out in the future 
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"Don't You understand? This is Greek to me! Except I spek Greek, this is like Aramaic to me, and not the Western Dialect I can read a little." - Dr. Walter Bishop
Special relativity is not "Eat Two Big Macs."
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