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Stoppable PWM fan?

T

Tau45

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Jul 31, 2016
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Hi
Is it possible to stop a fan using Speedfan? I want to buy a 140mm fan and set it as intake but i don't want it to vacuum the dust all the time. Now there is a 120mm non-PWM fan 1200RPM and the filter is very dusty after just a half of week. I tried to stop a 120mm fan (from my cpu cooler) as an example, but it stays 700RPM for 0%-35% PWM (I connected it to SYSFAN1). My motherboard is H81M-P33.
Do I need a special fan or my mobo is too poor to stop a fan?
 
Turn off the computer? Not sure I follow where you're going?
 
Get a fan controller.
 
It depends on the motherboard really. On my ASUS board, SpeedFan can do that, even though these are not PWM fans.
 
some Antec, and Cooler master fans used to have a switch on them for higher speed setting, and some for off & on
 
I mean I don't need much cooling when I'm not gaming. I also wanted an automatic software solution, my ITX case has no space for a controller.
 
Arctic F12 and F14 fans could work. They'll stop if set below 4% duty cycle.
 
Even fan controllers won't completely stop a fan from spinning. They could probably get it between 400 and 600rpm at the lowest but not a full stop like what you're looking for.

Just buy some dust filters and clean out your pc once a month with some compressed air and a hoover. There is no real way to have a dust free pc unless you submerge it in mineral oil or have an air tight sealed environment like some hospitals or laboratories that research killer viruses do.
 
FreedomEclipse said:
Even fan controllers won't completely stop a fan from spinning. They could probably get it between 400 and 600rpm at the lowest but not a full stop like what you're looking for.

Just buy some dust filters and clean out your pc once a month with some compressed air and a hoover. There is no real way to have a dust free pc unless you submerge it in mineral oil or have an air tight sealed environment like some hospitals or laboratories that research killer viruses do.
Click to expand...

Yes they will. I have had many Lamptron fan controllers that if the knob is turn all the way left, it turns the fan off.
 
MxPhenom 216 said:
Yes they will. I have had many Lamptron fan controllers that if the knob is turn all the way left, it turns the fan off.
Click to expand...

My bad, i didnt think they did. My nzxt mix doesn't so i assumed others don't either
 
You can have a look at these EK Vardar EVO 140ER fans.
For example I have linked below the EK-Vardar EVO 140ER Black:
https://www.ekwb.com/shop/ek-vardar-evo-140er-black

As it is described on their website, these fans from EK should stop spinning if the PWM duty cycle is below 25-30%.

They have both 120mm and 140mm fans from this type available.

I came across these when I ordered some 120mm Vardar fans for my liquid cooled setup.
I went with the regular version but not these as these were more expensive.
Besides, I don't want the fans on my radiators to stop completely. :rolleyes:
 
Last edited:
Thanks, I think I will try the Arctics because they are 2x cheaper and have a 6 year warranty ;)
That's my current setup:
https://drive.google.com/open?id=0B4t64r37eNmlQ0R0blhNY1ZUZjg
https://drive.google.com/open?id=0B4t64r37eNmlMWt2YVBrWFBDRTg
Side fan is 1200RPM non-PWM stock case fan. I'm going to make another plexi side panel and move the fan to the upper left corner to cool the GPU, but I can't decide what would be better:
3x120mm setup: https://drive.google.com/open?id=0B4t64r37eNmlS3VrQVZqcVNWaHM
140mm+120mm setup: https://drive.google.com/open?id=0B4t64r37eNmldkZHUXBMMWlNRXM
I want it to be as quiet as possible. Now the GPU (GTX950 Xtreme) hits around 70°C with 30% PWM (1100RPM) and the CPU (i3-4170) around 65°C cooled with SilentiumPC Fortis HE1225 700PRM while heavy gaming. While on idle or browsing the only hearable things are 700RPM CPU fan and HDD. PSU doesn't run its fan no matter what I do :D
 
Off-topic but no SSD?

An SSD is noiseless and it will give your system a snappy feeling overall with fast startups.
 
No need for an adaptor but minimum speed must be 1% because 0% is like no PWM signal at all and thus it would run at full speed.
I use it for semi passive cooling on my CPU and it works great in combination with Speedfan
 
iO said:
No need for an adaptor but minimum speed must be 1% because 0% is like no PWM signal at all and thus it would run at full speed.
I use it for semi passive cooling on my CPU and it works great in combination with Speedfan
Click to expand...
1% works great in Speedfan, set minimum fan speed to 1%, adjust curve to turn on at 50 degrees and it will cycle at idle, so depending how low ambient temps are, essentially the fans can stay off, but I'm on liquid not air cooled.

UJoBEvj.png




The drawback of cycling fans on and off is that it causes more wear/tear than if you left them on 24/7.
 
So this is wrong? Motherboard's 4pin slot is 12V so it seems like it won't stop...
chart_F12_PWM_1.jpg
 
Tau45 said:
So this is wrong? Motherboard's 4pin slot is 12V so it seems like it won't stop...
chart_F12_PWM_1.jpg
Click to expand...
No idea what that chart is from or what context.
 
Arctic fans luckily dont behave like shown on their graph, actually more like this:
1505225100356.jpg
 
Good.
So what do you think will be better?
3x120mm with Arctic F12 fans
140mm+120mm with Corsair SP140L and Corsair SP120L?

SP140L is 1230-2700RPM, SP120L is 1040-2300RPM
 
That app you have doesnt let you shut the fans off. You can shut off a PWM fan with 1% setting, but there is a minimum RPM that the fan will shut off it could be 9%. In other words 9% PWM could shut a fan off, and it could take 18% to turn it back on, and at 10% PWM that would be the minimum PWM duty cycle to keep the fan spinning at its lowest RPM. This all also depends on quality and specs of the fan, some brands matter. Until you know what your looking at, go to another fan brand and see if they have a similar chart and compare them to each other. You might fin a fan that shuts off at 13% duty for your app to work, but I doubt that.

Also, in that app the lowest the CPU fan can be set to is 12.5%. The 0 in the CPU fans speed box still sets the minimum fan speed to a default value and thats why it wont shut off, its not the fans fault here.
 
I know those bios settings won't let me do what I want. I won't keep the fans at low RPM, I will shut them off when GPU temp is <45°C (GPU fans spin from 50°C), and let them spin fast when it gets hot, I don't think RPM will be lower than 800. CPU fan (and maybe rear fan if I choose 3x120mm) will stay over 600-700RPM if CPU gets too hot in full passive (I bet it will)
 
I can switch off the fans AND close the top vents on my H1

02b.jpg

giphy.gif
Click to expand...
For a CPU fan, I still recommend to leave it at low fan speed than shut it off completely.
 
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