Silence, space-saving, the air flow on a chiller "Megahalems rev-C" to an i7 3930K. That's what I was looking, and this assembly I think I found a good compromis.Le all in a box "Silencio 650 modified" (the original changed 3 fans) is the assured silence, important as it will turn 24 / 24 in a chambre.Merci the Noctua premium manufacturer and Amazon.