I have this exact same problem except for one thing I am running a supermicro cse 846 with 7,000 RPM fans when server is an idle my temperatures are normal the hard drives run around 40 to 50 c and the rest of the system runs around 46 both of the CPUs so I believe that you have a very low quality fans in that system so I would go and replace all of them with 7K fans they're 26 to $27 a piece