Just swapped the Fan out with a Akasa Apache which made a big difference to noise over stock.
http://www.overclockers.co.uk/showproduct.php?prodid=FG-061-AK&groupid=701&catid=57&subcat=4
The pin mod I made
Stock
BLK, YEL, GRN , BLU
Modded
BLU, BLK, YEL, GRN
Enjoy.
Is this easy to do? I have my server in my bedroom... don't ask, flateshare too complicated, so it needs to be near silent.