Mine is noisy. My HX 750 fan is spinning pretty fast, its taking in a lot of air and the stuff coming out is really cold. Its not an issue of load either, my rig isnt exactly power hungry.
EDIT; noise is the psu fan. Did several startups, and started to note psu noise kicking in usually on moving into windows noise in bios was fine. After 30 seconds or so fan seems to throttle up, restored bios defaults. same issue, troubleshot it and I am left at;
a. bad fan makes noise once it has warmed up.
b. stock component/setting in system causing psu to think it is under load.
I tend to b. my crosshair 3 doesnt seem to be too fond of the 965, chip was released after board, doesnt seem to be specifically catered to, might be a bios issue.