its still just a dual processor machine, with 2 cores per processor.
shouldnt be any louder than Rev A G5s.
with time and technology comes advances, and one would think (just like new powerbooks could NEVER be thicker than they are now) that things would get quieter in the next gen.
Super quiet. The only time the fans come on is when you do something really intensive or one of the drives come out of sleep mode. But for normal desktop activity, makes no noticable noise.