differences with classic PSP and slim:
AtE3 2007, Sony announced that a new version of the PSP would be released in September 2007, for all regions.The redesigned PSP is 33% lighter and 19% thinner than the original PSP. The redesign also features composite TV output, supports charging via USB, double the onboard RAM (32 MB to 64 MB), and has a brighter screen. It also cache UMD data in memory to decrease game loading times. The WLAN switch has been moved to the top where the old IR receiver was to avoid accidental switching, and the speakers have been moved from the bottom of the screen to nearer the top, to prevent users from accidentally blocking the speakers with their hands
The PlayStation Portable uses the common « candybar » form factor, measures approximately 17 x 7.3 x 2.2 cm (6.7 x 2.9 x 0.9 in), and weighs 280 grams (9.88 ounces). The front of the console is dominated by the system’s 11 cm (4.3 in) LCD screen, which is capable of 480 x 272 pixel video playback with 16.77 million colors. Also on the front are the four PlayStation face buttons (Triangle, Circle, X, Square), the directional pad, the analog ‘nub’, and several other buttons. In addition, the system includes two shoulder buttons and a USB 2.0 mini-B port on the top of the console and a WLAN switch and power cable input on the bottom. The back of the PSP features a read-only UMD drive for movies and games, and a reader compatible with Sony’s Memory Stick Duo flash cards is located on the left of the system. Other features include an IrDA compatible infrared port, built in stereo speakers and headphone port, and IEEE 802.11b Wi-Fi for access to the Internet, ad-hoc multiplayer gaming, and data transfer.
The PSP uses a 333 MHz MIPS R4000 (32-bit) CPU, a GPU with 2 MB onboard VRAM running at 166 MHz, and includes 32 MB main RAM and 4 MB embedded DRAM.The CPU was originally locked to run slower than the hardware was capable of and most games ran at 222 MHz. However, with firmware update 3.50 on May 31, 2007, Sony removed this limit and allowed new games to run at a full 333 MHz.
The PSP includes an 1800 mAh battery that will provide about 4-6 hours of gameplay, 4-5 hours of video playback, or 8-11 hours of audio playback.