In our noise level tests we switched off all the case fans and replaced the AMD Radeon HD 7950 graphics card with a HD 5550 passive model so were just taking into account the noise generated by the cooler fans themselves.
We measured the noise level with a Digital Noise Level meter at a distance of 1 m from the front of the case.
In the noise level tests, the results are the opposite of the temperature tests, showing how the Corsair H90 and H110 cannot match the high-end air coolers for acoustic performance.
Solution?
We would recommend that those concerned either make use of the PWM fan control on their motherboard or replace the fans with higher quality, low-noise models.