I'm building my first computer and I'm completely lost on what power supply I need. This is what I have so far: http://pcpartpicker.com/p/11ASj. Thanks for the help.
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If you want to have the option of adding a second graphics card in SLI, I would recommend the XFX Core Edition 750W. If not, the 550W version would be sufficient... but it's only $10 cheaper right now, so that's IMO not really worth it.