T410 Fan Speed control?

Hello,

I have a Poweredge T410 that runs just fine. I have it in a separate room in my apartment and the noise isn't that bad. There is only one source of noise and that is the 120mm fan in the back. I'm reading the values from iDRAC6 Express that the fan RPM is 2.640 and the temperature on the motherboard is 27 degrees Celcius, that seems pretty normal, right? The BIOS setting for the Power Management is set to OS Controlled, with minimum power except for memory performance.

Now, I know that the room temperature is vital when it comes to fan RPM's, if the outside air is cool, that means lower RPM's.
My question is if it's possible to lower the fan speed even more, perhaps down to 2.000 RPMs or lower. I'm running Windows Server 2008 R2 straight out-of-the-box.

Are the default drivers taking care of power and fan management in an optimized way? Should I download the Dell drivers, will they make a difference for the fan RPM? I don't see anything mentioned about what drivers controls the system fans.

Thanks!