Silentmaxx ST-11 PRO Case
 

Well, with the Silentmaxx ST-11 Pro, the hum was hardly noticed. What I heard was the power supply fan and the 80mm exhaust fan. The acoustical material does a very good job in absorbing the noise. Now, if you dump all the unwanted fans and go with a water cooling setup in this case, I'll bet you will be asking yourself if the computer is even powered up.