Yes, of course I could but that requires spending money, to which I am allergic whistling
Also there are mixed reviews on many of the common PWM controllers (reliability problems). Someday I'll build my own, it's not that complicated to design, but I'm feeling lazy at the moment wink

So for now, is there any point in keeping the fans turning on low speed? I could just hook up the resistor with jumpers and see if it makes any difference.