Strange. I did not take the time to find it a second time, but I had two tests this early morning who showed exactly the opposite outcome, in numbers.
Anyhow, I wait and see how the default cooler performs. I don'T use tpwer vents anyway, but have a silent, small room ventilator positoned behind the tower, pumping air into the tower, I can feel the "jetstream" on the front
So, I am sued to a certain noise level, and it is okay. I just do not want it to become even louder.