Problem with that cooler is there is a top and bottom, but you can blow/vacuum it out by just popping the case off.
As far as which one is quieter, I would read reviews on that if you dont get any personal testimonials (google gtx 570 twin frozer reviews for example).
As far as which one is quieter, I would read reviews on that if you dont get any personal testimonials (google gtx 570 twin frozer reviews for example).