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.
The acoustic performance of this case is quite good. It wouldn't be classed as silent, but the noise levels are never that intrusive.
Shame no one I deal with online stocks the actual case, no UK stock at all. sucks 🙂