How to upgrade my Integrated graphics using Intel GMA x4500

[NullOverRide]

I am desperately need to upgrade my Graphic cards but I want answer to my question.
I can't play my favorite games in my pc due to my graphic cards are low.

My computer is HP-p6340d.
Product specifications found Here.

It said
Integrated graphics using Intel GMA x4500
Also supports PCI Express x16 graphics cards*

NOTE:*Either integrated graphics or the PCI Express x16 slot are usable at one time; they are not usable concurrently.

What does it mean..
Can I upgrade my graphic card?

 

[ak47jar3d]

Yes, you can, but you will have to switch power supply since no video card can run with 250 w. If you tell me you price range, I can recommend parts.