The fans are excellent. Even at full speed (600 rev / min) have virtually inaudible, turned down no longer perceptible. The air flow rate is very high, the pressure behind it, of course - because of the size and the speed - not so great (for very thick watercooling radiators therefore rather not optimal) but they are quite outstanding case fan and absolutely suitable for "Silent fetishists" ^^ - like me.
I have a i74960X at the start together with GTX nVidia card with water cooling (only for the CPU) and the fan in the housing in use. There is even under load and the stress test (almost) total silence. So I like that;)
