Might want to read this review:
Its of a similar card as yours. Its not a bad card at all for the price you paid. Plays most games well at 1024 x 768. Performance is between an FX5200 and a FX5600 according to the article.
All FX5500's seem to be 128 bit (which is good). You can probably get FX5600 performance if you overclock a little.
Good luck! Enjoy your new card