How do I find the right graphics card for my computer?

What is it I have to look at when buying a new graphics card? I bought a hp desktop 1 year and a half ago and I want to upgrade the graphics card but dont know how. How do I know if the graphics card will fit in my computer and if it will be able to read it. Sorry Im a bit new at this so I would appreciate any kind of help.
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  1. What's ur model number and budget
  2. iceclock said:
    What's ur model number and budget

    The model is p7-1247c. Budget $150
  3. Best answer
    U need new powersupply. Xfx 550 watt powersupply plus Radeon 7700
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