The link you gave didn't work for me, but you need a 400W PSU some variants of that card, which version do you plan on getting? A new link to your current PC would help also.
Thanks for the new link, but the card will not work in your PC. It has a 12V rail rating of 5.5 amps, and even the reference card needs 5.8, and any 3rd party variant would be more. Sorry.