As far as processor, the key thing to remember is the speed of your bus. Even if a system has a 2.6 Ghz prc it will only really has a bus speed of 400Mhz. Still a greater than 1 ghz prc will interally get the job done, that "Bottle neck" you are really looking for is there. Think of it like driving a porsche wil tires that will explode at 80 mph, yeah, it can go faster, but the tires will only spin so fast.