The most significant improvement of GT4 over previous offerings, for most, has likely been the evolution in the physics. Players must learn even more about the subtleties of real life racing in order to be able to 'drive' effectively in the game compared to previous racing games. However, traction and stability controls remain available to provide realistic driving aids for relative beginners, whilst they learn by completing various licence tests.

Battery life is heavily dependent on the game chosen; games such as Lumines are expected to greatly extend the battery life of the system, with graphically advanced games (or games that frequently access the UMD drive) such as Ridge Racers providing shorter battery life. Sony Corporation COO, Ken Kutaragi, has compared the system to the Walkman, in that battery life will be improved with each product revision, and has outlined some steps (switching to a different fabrication process, for example) which will be used to improve the system's endurance. Currently the PSP's CPU is fabricated using a 90-nm process, but Sony has 65-nm and 45-nm technology available.


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