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 system.
This result is impressive considering the fans are running at 2400 RPM. It is worth noting that the noise level drops to under 30 dBA when running the fans in PWM mode.