Controllable Fans - PWM or Rheobus or ?

[liguhy]

PWM fan controll sucks if you are after silence, your fans are noisier and I can post proof of this if anyone would like.

Certain fans will make a "howl" or whine due to PWM control.

With rheobus controll you need to make sur eyour initial voltage is high enough to get the fan spinning, then you can lower your voltage a bit more and get smooth silence 8)

After wieghing all options i went with the koolance TMS-200 and expansion board.

the only key thing it is lacking is direct interface to your CPU temps, but in honesty this is a software problem that may or may not be addressed. I am hoping someone can hack the software and make it happen, like really if other programs can read system onboard temps, why cant koolance?

The aquaero is very nice, but not enough juice for me.

I am running 12 140mm fans plus 2 ddc pumps. just on the cooling loop.

like wise mcubes is not enough juice for me either, unless im gonna daisy chain multiple units together, yeah forget that. Plus the software is somewhat inferior in my opinion.

haven't you wondered why fans howl due to PWM control? Is it a problem mismatching a non-PWM fan, an inferior controller, or some other factor? Whining is such a subjective thing bound by circumstance it could be anything, a fluke fan or just how one particular fan brand interacts with another. I've read XS posts where the same controllers with different fans (or visa versa) have yielded different noise/tone issues. I'm interested in fleshing these out as objectively as possible.

I've also noticed on XS posts some controllers and/or fans have issues when powering up to non-full power. A few controllers have explicitly designed full power on startup and then to user-set power level to prevent this. These features are things I want to find out and note. Details like this really are what makes a controller/fan the "best" in my opinion.

P.S. Please indicate the pin number you're using and/or if they're PWM or voltage controlled just so we know the details of your perspective.