Kotaku has a little more information on our previous announcement that the PSP's CPU has been intentionally throtlled.
Today, I can confirm that the PSP’s bus speed was indeed powered down to 111 Mhz to help increase battery life. And I can add that the Sony will likely start releasing a patch to unlock the full power of the PSP on a game-by-game basis. In other words, when a game like Gran Turismo hits the PSP, it will likely come with coding that will temporarily ramp up your PSP’s bus speed to its full potential. And when you stop playing the game, the PSP will power back down to it’s energy saving reduced speed.
My informants also tell me that the slower-than-advertised bus speed isn’t the only nasty little surprise in the PSP for developers. The portable is also a little cobbled in the memory department. In spite of the fact that the PSP has a 32 megs of memory on board, the portable’s operating system actually sucks up a full 8 megs, leaving programmers with a mere 24 to play with.
The PSP is not hardware limited by clockspeed; this is developer configurable so there won't be a patch to "fix" your psp. Eg Namco underclocked the psp's chip for Ridge racer for better battery conservation.
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