On the maker's website you should find some "power requirement" or so spec. AFAIK it's not how much the card needs on its own, but what total supply must a PC have counting with other comparatively average components.
Or if you're planning on replacing the gfx card maybe replacing the power supply too is an option, depending on what you want?
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Last edited by Japo; 25-02-2015 at 06:01 PM.
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