Today NVIDIA is unveiling the GeForce 9800 GX2, which replaces the GeForce 8800 Ultra as their most powerful Graphics Processing Unit (GPU). Last generations GeForce 8 Series has been NVIDIA's most successful GPU to date as gamers who invested in the high-end 8800 GTS and GTX graphics card have enjoyed well over a year of top-notch 3D performance and image quality to match.