FYI you can look into aftermarket cooling solutions if the noise level is bothering you. Or you just want to keep the temps low even if they are within manufacturer specs. Have a look here:http://www.thermalright.com/products/index.php?cat_id=30
personally I'm a fan (pun intended) of using this sort of stuff for the sake of keeping my rig quieter and cooler for not that much extra in cash.
each their own though.