Go with a lenovo RD450, they are amazingly quiet and work with v3/v4 xeons. I've gone through many systems (Dell R710, R720, R815s, Supermicro 1, 2, and 4U including the 846 - w/ x8, x9, and x10 motherboards) and they are all crazy loud compared to the RD450's.
My current setup is:
Server #1...