I run my fan direct to a fan controller, which means you don't have to mess about with the knob at the back of the PC.
I still find it noisier than most 120mm fans even at 5v (I'm very keen on running a near silent set up). I experimented by reversing the fan, as well as the exhaust fan on the case, so now the case fan blows into the Tuniq, and the Tuniq fan blows back into the front of the case - odd I know. This has produced about a further 6C drop in Core temps, so now, I switch the fan off for normal duties (temps are in the 40s), and onto low when gaming (temps are in the 50s)... Job done.