In our noise level tests we switched off all other fans in our system, ensuring we just took into account the noise generated by the cooler fans themselves. These tests were run with the GPU at full load in Furmark.
We measured the noise level with a Digital Noise Level meter at a distance of 1 m from the front of the system.
These noise level results are impressive, but will vary greatly depending on the specific fans that you use with the cooler.