How do you know if a power supply is compatible with your computer

I have a compaq presario CQ5320 and im in need of a new power supply. I am planning on upgrading to a gtx 260.
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More about power supply compatible computer
  1. That Compaq can use any standard ATX PSU. Its standard 250w PSU is not enough for a GTX 260 which requires a 500 PSU (see link below):

    What is your budget for a new PSU?
  2. Highest would be $100. Something that can run the 260 and is cheap would be preferred.
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