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Can I have fans that turn themselves off? What kind of fans?

post #1 of 20
Thread Starter 
What I am wondering, is: would I need special fans to get to have them power off while the computer is running, and ramping up only when it gets too hot?

I am here simply assuming that there is bios features for managing fans this way, and I am wondering if there might be some fans only that can be reliably turned on and off.
post #2 of 20
https://www.arctic.ac/de_en/arctic-f12-tc.html
Quote:
Ideal Temperature Control
The temperature sensor is on a 40 cm cable and can be placed in the warm areas of your computer. This assures temperatures no higher than 38 °C anywhere in the case and supports the cooling of your CPU or graphics card. On the other side this fan keeps the noise level absolutely minimal and only increases the speed if necessary.
post #3 of 20
Is that 38c adjustable? That's quite warm for a case especially in cooler climates
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post #4 of 20
I know that modDIY sells thermal switches :
Like this one (40°C threshold) : https://www.moddiy.com/products/modDIY-Fully-Automated-Thermal-Switch-40%C2%B0-Threshold.html

They sell 50°C / 60 and 70°C version too.
These switches are normally open and when the temperature goes above the threshold the switch closes and can turn on a fan for example.
post #5 of 20
Thread Starter 
I am worried about having fans not spinning up again, if they stop spinning. I've seen fans in my case not spinning up on boot, though I have forgotten the context of it all.
post #6 of 20
My CoolerMaster JetFlo 120mm PWM does that. It'll only start spinning when my CPU starts to go past 40C. I set this in BIOS. It can do it continuously (start/stop). Never had an issue. When I'm just browsing, it's completely off.
Edited by TheBloodEagle - 4/23/17 at 9:57pm
post #7 of 20
Quote:
Originally Posted by Decoman View Post

What I am wondering, is: would I need special fans to get to have them power off while the computer is running, and ramping up only when it gets too hot?

I am here simply assuming that there is bios features for managing fans this way, and I am wondering if there might be some fans only that can be reliably turned on and off.
You are correct, fan startup and speed control is not done in the fan. Some motherboards have this feature, but most do not.

As Gamer388 said, there are thermal switches available, but most are not what I would want to use .. mostly because they do not supply enough power to start fans at low speed. Ever notice how our case fans all spin up to higher speed for a few seconds when you first boot up your computer? There is a combination of reasons, but one of them is to get the fans all running and warming up before they drop to idle rpm. wink.gif

As oaijsdoias posted, the Arctic TC series have their own temperature to speed control, They are the only fans I know of that have this .. and they always run.
Quote:
Originally Posted by oaijsdoias View Post

https://www.arctic.ac/de_en/arctic-f12-tc.html

Quote:
Originally Posted by Cyro999 View Post

Is that 38c adjustable? That's quite warm for a case especially in cooler climates
Quote:
Originally Posted by Cyro999 View Post

Is that 38c adjustable? That's quite warm for a case especially in cooler climates
Temperature to speed can be adjusted by moving the sensor closer to / farther away from heat source. wink.gif
post #8 of 20
Thread Starter 
I'll go check out that fan of yours. smile.gif I also like the white + black colors, which also is the color palette of my new Ryzen build.

Although I wish to have a more passively cooled computer with my new Ryzen build, I wouldn't mind having a couple of fans helping cooling the gfx card during gaming. So my goal is to have a silent computer when browsing and other less intensive work on my computer.
post #9 of 20
Thread Starter 
I have to ask:

Is there ANY case fan that will spin down, AND, spin up again?


One motivation for asking this, is that if I were to set a fan profile in the bios, or software, for getting a really low rpm, I DON'T WANT THE FAN TO STOP WORKING, because of how the fan't won't spin up again.

This in turn makes me wonder, how dumb are fan control software? If say a fan was given a really low rpm idle state, surely it would be important that there is enough voltage to kick the fan up to speed and not risk having it just sit there?
Edited by Decoman - 4/24/17 at 3:14am
post #10 of 20
Thread Starter 
Consider the Noctua IndustrialPPC NF-A14 fan (500-2000rpm).

If I could have that fan stop, and reliably have the fan start up again, I would be happy. But would it work?


Btw, I have the 3000 rpm version on my home made spray booth. smile.gif Presumably "overkill" for a computer build with a 3000 rpm fan.
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