Change x300 graphics card from a Dell Inspiron 9300

I have a Dell Inspiron 9300 graphics card with an ATI Radeon X300 with 128 MB of memory. My son took the game Prince of Persia to the famous Christmas X300 but my computer does not seem strong enough and the game can not start. On the cover they say they need at least 256 MB of memory and one of the following cards: ATI RADEON X1600/1650/HD2000/3000 series.
The question is: what is one of these cards is compatible with my laptop and can I change it easily?
I am novice and thank you for your response in advance.

Hi,

Since it is a portable, it is very difficult to change the graphics card especially for dell. For your model you will not find anything really more efficient and especially at a reasonable price. Normally it does not change the graphics card for a laptop if it is HS, but not to put more efficient, because it is expensive and there are many constraints when compatibility is a more powerful .
The solution for video games is really moving on a PC will be fixed easily upgradable or buy a game console.

Or take the laptop directly adequate.

yes, but more expensive.