I've been looking for a solution to control the case fans.

I want them to stop when the system is idle and the temp is around room temp and then gradually start pumping air when the load gets bigger and temp is rising, until they scream and create a hurricane when the system gets hot.

I can find lots of ways to control it manually, or can do a decent job as my temp controlled Pabst. They go slow when cool and a bit faster when hot.

I want stopped when cool, and screaming fast when hot.

I've even considered using 220v fans as they can pump a lot of air, and wont put a load on the PSU.

 

/Rene

Some ideas for anyone wanting to do this

http://www.heatsink-guide.com/content.php?content=control.shtml

http://www.makingthings.com/teleo/teleo/cookbook/autofan/index.htm

 

 

I've been looking for a solution to control the case fans.

I want them to stop when the system is idle and the temp is around room temp and then gradually start pumping air when the load gets bigger and temp is rising, until they scream and create a hurricane when the system gets hot.

I can find lots of ways to control it manually, or can do a decent job as my temp controlled Pabst. They go slow when cool and a bit faster when hot.

I want stopped when cool, and screaming fast when hot.

I've even considered using 220v fans as they can pump a lot of air, and wont put a load on the PSU.

 

/Rene

 

The problem with "stopped when cool" is that you can't tell if it is cool.  Pockets of heat are a fact and the only way to know that they are there is to move the air just enough to get a measurement.

 

 

Bill

This seems to be an old thread, However it did make me laugh.

 

I don't agree with off then on with steroids.

It leaves the system in a situation where it will be hot, then cool off rapidly, then hot again.

It will exasperate the whole heat creep condition with expansion and contraction of the parts.

 

Better to go with a large number of 120MM low RPM fans.  Just keep the air moving, if even at a low flow.

 

I move approx 60-90cfm with 4 120MM fans and I can barely hear it in my centurion 590.

You don't want them "off" when the system is cool.  Most fans have a speed at which they are practically inaudible.  There is no need to reduce speed below that level except to save a couple of Watts of power.

I see no reason why the fans should be running when the drives is around room temp.

 

The fans do need to run or you will get hot pockets.  Parts will get hot, the fans will start spinning some parts will cool off, others will take much longer to cool off.  The hot/cold approach is bad for the metal to metal contact.

 

For the record, when I said the thread made me laugh.. it was because of the title, sleeping or on steroids.

I wasn't ridiculing anyone, The title just made me laugh.

I was in fact, presenting a reason why I think the logic is flawed. The system should be as close to room temp as possible, but it may not be possible if no air is flowing what so ever.  The CPU, power supply, north bridge, RAM & cards will always make heat.