For AGP video cards that require being plugged into the power supply, it's not so much how many watts the PSU pumps out at it is how many amps it supplies on the +12V rail. A minimum of 24 amps is recommended, more if you have many devices connected that use the +12V power, like cooling fans, drive motors, etc.
Also, be careful about the wattage. Many PSUs that claim to be 500w, or whatever, are actually not. They're referring to the peak output that can be used only for short duration. Look for PSUs that list the max sustained output. That is what you should expect to have as a constant power level.
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