pcsx2 hardware requirements:

Minimum
Windows XP Service Pack 2/Windows Vista or Linux 32bit/64bit
CPU that supports SSE2 (Intel Pentium 4 or AMD Athlon 64 or faster)
GPU that supports Pixel Shader 2.0 (NVIDIA GeForce FX series or ATi Radeon R300 series or later)
1 GB RAM

Recommended (Will run 50-60fps)
Windows XP, Vista, 7 or Linux 32/64 bit
Intel Core 2 Duo 2 GHz or AMD Athlon 64 X2 2.5 GHz or faster CPU
GPU that supports DirectX 10 (NVIDIA GeForce GTX series or ATi Radeon HD 2000 series or later)
2 GB RAM (3 GB or more if using Windows Vista or Windows 7)

viac tu v official wiki:
http://wiki.pcsx2.net/index.php?title=PCSX2