Mmm.. if it worries you much, then the fan speed in your docks can be adjusted -- disconnect the power, pop off the bottom panel (4 screws), and look inside for a potentiometer (variable resistor) soldered to one of the pins on the power jack. Space is tight, so be careful not to mess anything up. The pot can be adjusted with a tiny slotted screwdriver inserted into the middle slot. A small twist goes a long way.

Cheers