I'm needing a 500w power supply, what options do I have with this pc?

I have similar HP cases - they are all slightly different. Take a tape measure and see how much room is available. The card is 9.49" (length from the back of the case to the tip of the card) and 5.39" (height - this shouldn't be a problem) x 1.67" (wide - this shouldn't be a problem either).

The PSU is a standard size...they are always a little snug, but they fit.
 

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