PSP clock speed increases

Sony latest firmware update for the PSP, version 3.5 has modified something in the PSP that was there from the beginning. The update allows developers to access the full speed the PSP CPU is capable of, 333 MHz. This has removed a puzzle that was existing in the Sony PSP from the time of its release.
When the PlayStation Portable was released, it was a little known fact that games running on the PSP would run on a clockspeed of 222 MHz, while the unit packs a CPU, the MIPS R4000, which is designed for a clockspeed of 333 MHz. Then another game, High Impact Games’ Ratchet & Clank: Size Matters was released that is reported to be running on 266 MHz, indicating that Sony was letting gamers slowly move up on the path of using the full power present on the device.
Sony has never disclosed as to why the development kits limited the clockspeed allowed to developers. It still is not disclosing those reasons, although now it is allowing games to utilize the full power of the device. This will not however work on existing games, but will work on new games that are specifally designed to use this increased speed.