http://www.notebookcheck.net/
I think here you can compare most models by searching for their name.
You can also compare the graphics cards in it, I'd say if you want to play newer games you should at least have an ATI or Nvidia from class 3 upwards, I'm not too much into it, though, so take it with a grain of salt.
http://www.notebookcheck.net/ATI-Mob...50.9596.0.html