It depend on which game you want to play. nvidia 9600m gt cuda 512 mb that's what matter most and with this graphic card you can play almost every latest games, halo3 need for speed shift.
if you are using window vista or window 7 make sure you have good piece of machine. make sure you have a good graphic card. To me its more likely looking as graphic card and ram problem ..
I am not sure about this model but i assume there will be a whole series. Check out @ tg- tiger direct.com they will surely be able to help you out in that.
Cheerz