I just finished Prey, the latest FPS from 3DRealms last night. Played entirely on laptop, installation on an external SATA2 WD drive connected via USB2.0. And apart for a few times (wide landscapes), it ran smoothly from start to end with settings set to Medium-High.
So 1400 is not bad at all, thought a 7600 with own memory would be better.
What I would improve in mine, not necessarily for games, is the slow SATA 5400 I have right now