With the two case fans off you don't hear a thing (the only fan running then is the psu that comes with the case and it's very very quite). If i put the two case fans on and set them to LOW it's still quiet and only audible if you focus on it.
I decided to let these case fans on to create some "active" airflow and keep my cpu/mb cool, the summer is coming and my living room tends to warm up quite a bit then and i don't want to fry my components although they seem to cope quite nice without the case fans.. better safe than sorry right
I will do some HD or 3D tests to stress the system to see what the temperature does (with fans on/off)
Oke first simple report about the temperatures. System has been running pretty much all day (for 8 hours). MediaPortal with TVServer running and watching tv. (Case fans on LOW)
System: 34 degrees celcius
CPU: 27 degrees celcius