Looks like you have a 300 watt PSU. Go to Newegg link below see what fits a 300W PSU. I plugged in your specs and it looks HP just about maxed out your PSU @ around 284W. Go to the link below and click on the video card you would like to own and it will tell you approx what PSU you'll need to get to support it. I recommend getting a PSU just a little stronger than required. Play around with it and let us know.....
http://educations.newegg.com/tool/psucalc/index.html




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