Open the games "Video Settings" and it will show you what video card is being used.
Also note, you will need to disable any and all power management in the laptop. This includes the new power management options, in the BIOS, that Intel has built into the CPU itself.
Generally speaking, make sure the "Maximum Texture Size", in the games "Video Settings" is set to 256, and set the anti-alias slider to 0. See if that helps.