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650W should be good. List the make and model so we can check the +12V amps which is more important than the total wattage.
One of the ATI Mfgrs recommends 550W for two 4850 in Crossfire:
http://www.sapphiretech.com/us/pro [...] p?gpid=244

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Tom's Hardware > Forum > Homebuilt Systems > New System Build > Power Supply check
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