What graphic card do you recommend for playing skyrim on high
So what video card is recommended to play skyrim and xcom on high settings
I would look at a HD7870 or higher. What is the wattage on your HP's power supply (on label on side of power supply if you don't know)?
if the system came with a 7450, it wouldn't come with a power supply strong enough for a 7870. you could put in a 7750, it doesn't require a power connection.
if you are able to swap out the power supply, a 7850 or 7870 would be advisable.
I agree with an HD 7770 for a minimum with those games. However, as has been said you will likely need a new power supply anyway making something stronger more advisable. What resolution do you play at? At 1920 x 1080 I would say an HD 7850 would be your best bet for the money with an HD 7870 an even better choice if you can fit it in your budget.
Here is an excellent article Tom's does every month on the best cards for the money.