NVIDIA Quadro FX 1500M is the version of 7900 GS video card for notebooks, which is optimized for CAD and professional 3D-applications. Technically, it has the same or similar chip (G71 architecture), but with other Bios and support for professional drivers. The gaming performance is clearly worse than the 7900 GS (because of the application optimizing). Nonetheless, the most modded drivers can be used, so the Quadro FX 1500M is more a 7900 GS (for the operating system).