Hi. I would like to know whether the Mobility Radeon 4330 or 3650 is better. I need to be able to run Left 4 Dead, Killing Floor and Oblivion. If you think that neither of those are suitable, please let me know what card you would recommend. My budget for a new laptop is £500 and I am quite prepared to change a graphics card myself. Thanks very much for your help, Ben.