Cant select correct GPU

[AnyOldName3]

Try setting Dolphin to a high performance profile in your nVidia control panel. Sometimes nVidia chips don't show up, and the HD4000 is the only listed option. However, Dolphin should still automatically switch to the better GPU when a game is running. If you can switch between 1x IR and 2x IR with barely any speed decrease, then you're using the GT 640m.