An article at Consoul Games includes details from an SCEA presentation at this year's Game Developers Conference, in which Mark DeLoura, SCEA's manager of developer relations, revealed that the PSP is capped by software at 222MHz. This means that the PSPs we are now playing are running below their potential of 333MHz. The article goes on to mention the restriction is only temporary and is necessitated by current battery technology (or the lack thereof).The PS2's Emotion Engine (CPU) runs at 294.912MHz and it's Graphics Synthesizer (GPU) runs at 147.456MHz. The PSP's Emotion Engine (CPU) runs at 333MHz and the Graphics Synthesizer (GPU) runs at 166MHz. So basicly once the bettery technology gets a bit better, the PSP will be looking a lot better then our PS2's.