I played around with a Sony sz110 that had the 7400. The games I tried:
Battlefield 2, Unreal 2004, Tribes Vengeance, Guild Wars, LOTR Battle for Middle Earth II, Madden 2006, CS Source, Halo, Far Cry, COD2.
It played all the games at mid-high settings with no problem at all. The only game that ran somewhat iffy (less than ~25 fps) was COD2.