Ok I'm trying to learn this stuff too, so let me see if I got this straight.

Even though the PS2 only has something like a 600mhz processor, your computer would have to be 2-3x faster right? And that's because a PS2 even though it's basically slow, it's devoting ALL of that 600mhz to running the game, while a computer is using most of its power to keeping a hundred other things going at the same time.

That basically it?