While NVIDIA announced their new 55nm based laptop graphics cards today, ATI broke cover of the new 40nm process based ATI Mobility Radeon HD 4830 and 4860 graphics cards. The HD 4860 and 4830 are the world’s first graphic processors based on 40nm manufacturing technology and are capable of beyond 1080p gaming on notebooks.

Though both the cards will have 640 stream cores, the HD 4860 will have 650MHz core clock speed and support for GDDR5 memory, whereas the HD 4830 will have 400MHz or 600MHz core clock speed and support for older GDDR3 memory.

AMD says that both the graphics cards distill 3D engines from desktop HD 4800 counterparts, and are capable of 1080p video playback and beyond 1080p gaming resolution. But because of the smaller 40nm process, they have relatively low power and heat requirements making them usable in ultraportable notebooks also. The Mobility Radeon HD 4830 and HD 4860 will ship in Q2 2009.