There's 4 settings in the bios for the fans ranging from fairly loud to silent.
On the stock coolers (friend is borrowing those so I can't get a pic) those things only have 60mm fans that turn 5000 RPM and sound like jet engines! These are nothing close to that even full on.
Alright, that's re-assuring. I'd be looking to use this as a server (not an extreme gaming rig ) , probably host a game or two on it, and noise is always a pet peeve of mine