He can play GTAIV, not at full settings though.
GTA4 is less hardware intensive than Crysis, and a 9600GT can play Crysis @ medium-high. A 9600M GT would rank below a desktop 9600GT, but still be able to offer decent performance.
He should be able to at least play GTA4 at medium settings.
Alright, medium settings then for GTA IV, you're the answer I was looking for.