PowerEdge 650 fan speed

[Steve Shockley]

My firwall had a hardware failure, so I threw the drive into a Dell 
PowerEdge 650.  That worked fine, but now I can hear the fans screaming 
down the hall through a closed door.  Other than hardware changes (like 
a resistor or a non-1U server), is there anything I can do to shut this 
machine up?  Does anyone know if the fans in this machine would idle 
down on a "supported" OS?

It's running 4.6, FWIW.