Advanced Micro Devices unwraped two new graphics processors as it takes aim at rival Nvidia.

The Sunnyvale Calif.-based firm unveiled the new Mobility Radeon HD 4860 and Mobility Radeon HD 4830 chips on Tuesday. The chips use a new manufacturing process promising higher speeds and lower energy requirements.

AMD always seeks to deliver the most advanced, yet relevant technology to our customers, said Rick Bergman, senior vice president and general manager, Graphics Products Group, AMD

The new graphics processor can redefine mobile PC that take everyone to take a crisp, detail-rich images and outstanding visual effects and 3D gaming. They supports GDDR5 memory technology contributing to stunning improvements in game play and performance with nearly twice the memory bandwidth of GDDR3.

The two new graphics would be available in the beginning of the second quarter of this year through 2009 model quality notebooks from the leading notebook manufacturer ASUS.