Barely audible ventilation. I find quon longer hear the Seagate (in writing) that the fan.
Runs Windows Server 2012 DataCenter in original config: no big slow compared to a dual quad-core server and raid0 HDD. I think the hard drive is its low reactivity points, but this is not the goal for a storage server.
All components are recognized by Windows.
Chassis construction quality and reputable brand components (HDD Seagate, Samsung ECC RAM, NIC Broadcom ...). This is the HP ProLiant!
Super satisfied. At this price, there are no better!
A buy eyes closed!