As you all know PCSX2 is the best emulator for Playstation 2 till now. As it is still under progress people working on it haven't quite figured out how to make the computer resources work in exactly the same manner as in the PS2, but they have come far. Just to give you a hint about what specs are actually hidden inside the remarkable Playstation 2, i'v done some research and found these:

Main Processor Features

Graphical Features

Sound Features

Pcsx2 System Requirements

Now that you know on what specs Playstation 2 games are developed you can have a look at the system requirements of PCSX2 to find out whether your system has what it takes to run PS2 games fluently or not.