PSP

The PlayStation Portable (PSP) is a handheld game console made by Sony.^[3] Development of the console was announced during E3 2003,^[4] and it was unveiled on May 11, 2004, at a Sony press conference before E3 2004.^[5] The system was released in Japan on December 12, 2004,^[6] in North America on March 24, 2005,^[7] and in the PAL region on September 1, 2005.^[8]

The PlayStation Portable is the only handheld video game console to use an optical disc format, Universal Media Disc (UMD), as its primary storage medium.^[9][10] Other distinguishing features of the console include its large viewing screen,^[11] robust multi-media capabilities,^[12] and connectivity with the PlayStation 2, PlayStation 3, other PSPs and the Internet.^[13][14]

CPU:  333MHz MIPS R4000 ( 420MHz for PSP Go ) 

RAM: 32MB ( 64MB for PSP-2000/3000/GO/STREET )

GPU:  UNKNOWN

TOP 4

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PPSSPP v0.9.7  /  2.5mb  /  Rating: 7.5/10  /  WIN /TEST VERSION / MAC  LIN

Currently the best choice emu for PSP, Its multi-platform and emulates a decent portion of games.

NOTE: You will need to update VC Run Time to 2013 version to use PPSSPP, get it here.

jpcsp r3402  / 15.7mb  /  Rating: 7.5/10  /  WIN32  WIN64  MAC  LIN32  LIN64

Constantly updating, jpcsp is fast becomming a great PSP emulator, written completley in java its surprisingly fast, and is just as good as its rival above.

PCSP v0.5.5  /  12.1mb  /  Rating: 7.0/10  /  WIN

Another great PSP emulator constantly updating, worth a look in as some even prefer it to the top two.

Soywiz r555  /  13.5mb  /  Rating: XX.X/10  /  WIN

We have not tested this emulator yet so cant give you a rating but from what weve heared shes a good one, the archive contains both win32 and linux versions aswell as the src.