To conduct our noise level tests, we replaced the graphics card in our system with a AMD Radeon HD 5550 Silence which was passively cooled. We also momentarily disconnected the fans on the CPU cooler so we were only taking into account the noise generated by the fans in the case. We tested the system with the fans at the maximum and minimum setting.
The large amount of adjustment in fan speeds offered by the twin fan controllers in this case makes for excellent acoustic performance. This can be fine tuned for the perfect balance between acoustics and performance.