psu

depends on how good of a graphics card you are getting, you will probably want to get a new one though because I think most HP's either come with a 250w or a 300w which willn't be enough to power a decent card

EDIT: Yeah you would want to get a new one then
 
how about getting a OCZ Powerstream 520? or, if you are on a a budget, get a fortron AX-500.
 
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