Somms is correct, the i9100/ XPS are the only Dell notebooks with an AGP8x Data bus speed... both the i8100 and i8200 have an AGP4x speed, and both can use the Quadro700GLGo with no problems. It would not be worth it to replace the motherboard with an i8200 one, it would become too expensive (you would need motherboard, RAM, CPU and the new graphics at least).
stu