is 550w PSU enough for r9280x

Kostas Kai Ama Saresei

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May 26, 2014
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hello guys im gonna upgrade my amd 6770 to a r9 280x 3ggbdr5 card
i heard it needs 750watt minimum but i doubt it needs so much i havent overlocked my cpu an i have 4gb ram could my psu run this card?
and why the way if i get this card will be able to run next gen games at 1080p high-ultra? at 30-60 fps?