For just stright up fan control nothing beats a Sunbeam Rheobus at <$9.
Four Rheostats that can handle 20watts each. Two or three fans can be hooked uo to each one. Never any fan clicking from PWM because it doesn't use it. If your fans will spin as mine do at 4V you have that option. XXoide had them at $7.95, SVC had close to the same price.
No bells or whistels,just VG fan control. I would use one Sunbeam over three of the Zalman brand. What kind of name is that anyway? Oh yeah! They make some kind of has been HSF.
j/k
Galvanized