I want put a good graphics card on my computer

Rybo

Honorable
Nov 4, 2013
421
0
10,860
I assume you're looking for a GPU to game with? If so you're not going to get superior graphics performance as finding a GPU to fit in that slimline case from HP will be troubling.
I'm assumeing something rather tiny like this: http://www.newegg.com/Product/Product.aspx?Item=N82E16814127765 would fit into that case, not to sure haven't ever used a slimline case like that before.

Also note the card is rather poo as shown in the video link: http://www.youtube.com/watch?v=sph6cjJeRdI

I would reccomend buying a new case and installing all that HP hardware into a new case and then spiffing up and buying a more powerful GPU if your looking to game on this.