the power supply can provide only 220 W it seems. Also i do not know much about the case. it depends on how much spacing there is in the case for the graphics card.
Though you can put in a new card in that computer, You might have to change the power supply to something better. Companies sometimes provides supplies of bad quality.
did you have any particular card in mind though?
you can upgrade provided
a) space is there in the case for new card
b) upgrade to a card that the psu can support
c) upgrade the psu along with the card.(probably the option i would go for)
Also a very important thing to know. you hp warrenty will be void if you open the case yourself and do the upgrading.