Controllable Fans - PWM or Rheobus or ?

[dsumanik]

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.

[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.

[dsumanik]

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.

I have Yate Loon 2 x 120 ultra 120mm, 2 x silverstone 180mm, 12x 140mm Medium Speed Silent Case Fan - but i have noticed this phenomina for years even back when 80mm was all the rage..

Analog is superior from a noise perspective in my opinion.

•Model: D14SM-12
•Air Flow: 62 CFM
•Fan Speed: 1400 RPM
•Noise Level: 29 dBA
•Power: 2.0 watt
•Fan Size: 140x140x25 MM
•Connector: Includes a 3-pin motherboard power / RPM connector and a 4-pin standard power connector

I have both a rheobus and PWM controller, the fans are daisy chained together 6 fans running off of one fan channel.

The howl is more or less prominent at certain RPM's, usually the ones you want to be ideally running at for the combp of airflow/silence.

PWM is inferior in my opinion, the only advantage it may have is the ability to get the fan to alower RPM before stalling but I havent seen testing to verify this. Maybe this weekend i will try it out. Maybe there are newer PWM friendly fans out there now that don't howl but im die hard analog because i know it is silent in all situations..so how do you improve on that?