U3 wrote:The Noctua is a quality fan. I installed it too not long ago.
When used without any (rpm reducing) adapters it is definately noticeable.
When using the LNA adapter, the noise is significantly reduced, but to be honest you can still hear it when working close to the mpc.
When you install the ULNA adapter, you cannot hear it at all. You must put your ear right to the fan to hear/feel it working. I am using this right now as i HATE noise.
(Be warned though, when you plug the ULNA adapter on, its spinning at a MUCH slower RPM speed and flowing less than the original fan. )
PS: make sure you dont go touching the inside of the mpc whilst its powered on/plugged in ok?
goodluck

if it's moving less air then how is it a good replacement?
That would mean less cooling than Akai deemed necessary.