how much noise makes a 5k iMac 4GHz

Does anyone has experience with the noise level of the new 2015 iMac 5k 4GHz (!).
I will order this Machine but I heard some people have problems with loud noise.

I have a macbook pro retina 2,6 witch makes low frequency noise when i work with ProTools Sessions at 60-80% CPU.

I hope the new imac is a little bit quieter and not louder.

Thanx for some help.

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how much noise makes a 5k iMac 4GHz