Need a upgrade power supply for dell c521

Hello, got new graphics card for my c521 , its a sapphire HD5450 and needs a 400w or greater . Does anyone know what power supply I need to get for my system?
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More about need upgrade power supply dell c521
  1. Power consumption of that card is so low you could use a few D cell batteries to crossfire a couple of them.
  2. How do I do that?
  3. Point is, your 280 watt psu isn't going to sweat a few extra watts from a 5450
    http://www.techpowerup.com/reviews/Sapphire/HD_5450/28.html
  4. Your pc has a 280W psu which is enough to power a 5450 no problem.
  5. I've installed the software which came with the card, but when I plug it in it does not work? tried the bios but nothing?
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