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Can I have fans that turn themselves off? What kind of fans? - Page 2

post #11 of 20
There is really no reason to have fans stop spinning. Most good quiet fans cannot be heard below about 600rpm, some even 700rpm. I have fans that will idle at 300rpm but have them set to idle at 500-600rpm depending on system. This allows them to flow enough air through case to keep everything cooled when system is not working or only light work load. Having fans turn of completely would likely cause components to be hotter at idle than under light load .. when fan start spinning again. wink.gif
post #12 of 20
hah

that's a tough question

not sure anyone has tested fans for reliably switching on and off like you request

the only thing that comes to mind is

I could set the fans rpm control in the bios to off
set low limit to 0
but keep temp control on as that would be a safe guard if the fans don't spin up

I'm not sure any fan control, either in bios or an aftermarket solution offers to go down to 0 rpm


I think my Asus let's me go down to 20% lowest
I think that translates to 300 or 400 rpm on my fans

still not what you want

only know the feature from graphic cards

now you don't need special fans
but you would need a controller that gives a bigger jolt to start up the fans reliably I guess and then goes to the lowest rpm specified
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post #13 of 20
Thread Starter 
Btw, I found this just now. The 140mm version of the Arctic temperature controlled fan.. Supposedly the rpm's are "0 - 1,350 RPM / Max. Airflow 74 CFM (126 m3/h)"
https://www.newegg.com/Product/Product.aspx?Item=9SIA1K65316580


Hrm. According to the photos shown on Amazon, the rpm count is different: "400-1350" I guess the Newegg's info is wrong.

https://www.amazon.com/ARCTIC-Standard-Noise-Temperature-Controlled/dp/B01MFGZTMG/ref=sr_1_1?ie=UTF8&qid=1493031133&sr=8-1&keywords=ARCTIC+F14+TC

Hmmm. Even Amazon have the rpm 0-1,350 info typed. Doesn't match the description seen in the product photos though.

Edit: I think I will simply order these, I can live with 400 rpms.

Sigh, even Arctic's own webpage lists wrong info. Listing their F14 TC as being as large as the F12 TC.

Ok. I ordered one of these just to test it out, and then I'll consider buying two more. smile.gif I have now started measuring my case temperature, to get an idea if this fan will actually ramp down to the lowest rpm, otherwise, I might be screwed if the fan stays at high speed "forever" because of a too high case temp.
Edited by Decoman - 4/24/17 at 4:24am
post #14 of 20
It's totally possible though, like I mention, on my Z77 Asrock Pro 4 motherboard and CoolerMaster JetFlo's do exactly what's mentioned, automatically. Looking at Speccy, my temp is 40C and it's off. It's also an awesome fan because the LED gets brighter depending on RPM (non-LED version exists). As soon as I do something more intensive, going at say 45C, it starts spinning at a low RPM. I don't do anything manually. I don't know if it's just luck because of my board or the fan though or both.
Edited by TheBloodEagle - 4/24/17 at 4:10pm
post #15 of 20
Quote:
Originally Posted by TheBloodEagle View Post

It's totally possible though, like I mention, on my Z77 Asrock Pro 4 motherboard and CoolerMaster JetFlo's do exactly what's mentioned, automatically. Looking at Speccy, my temp is 40C and it's off. It's also an awesome fan because the LED gets brighter depending on RPM (non-LED version exists). As soon as I do something more intensive, going at say 45C, it starts spinning at a low RPM. I don't do anything manually. I don't know if it's just luck because of my board or the fan though or both.

the Asrock

as far as I can see the Jetflo are at fixed rpm, with an adapter for silent mode (1200rpm) Warning: Spoiler! (Click to show)



these days a board or controller can change that

also the LED's change in brightness since at lower rpm less current flows


the issue is this
what if the fans don't start to spin up

I have used low rpm fans in the past and using a silent adapter (just gives less voltage) and they didn't even spin up

however in youre case it works because the board handles this

on my Asus the lowest setting is at 20% (whatever that translates to in real life terms), not 0
so it might be an Asrock thing
Edited by peter2k - 4/24/17 at 4:31pm
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post #16 of 20
Just clarifying that I'm NOT using an adapter. I'm using the full RPM range with PWM signal. If I want this thing can ramp up to max RPM of 2000 RPM (although I never max out my system really, I never bench). It's stated as minimum RPM of 800 but I can show you 0 RPM showing on my HWinfo. As I mentioned, in this case, they have no problem going from 0 RPM to XXXX RPM and back to 0 RPM and doing it all again automatically.










They're not fixed RPM unless you use an adaptor: http://www.coolermaster.com/cooling/case-fan/jetflo-120/




Tangent but about the LED and current flow, I know already and THAT'S exactly why I LOVE these fans. It's basically a design flaw because they changed that in newer models (CoolerMaster basically ended the JetFlo line and created the average MasterCase line) and every other LED fan out there with lights in the motor section offer full brightness at all times. These are the only fans that can basically act as an "activity" indicator for me. It's a huge plus to me when I have parts with LEDs and actually have a bit more to do than just bling/flashiness.


Also, I'm not saying one has to use these fans, it was just a suggestion and I'm just showing proof that indeed possible, at least PWM fans, can go from 0 RPM to XXXX RPM and back without problems.
Edited by TheBloodEagle - 4/24/17 at 5:53pm
post #17 of 20
not sure why you're so defensive
Quote:
Originally Posted by TheBloodEagle View Post

I don't know if it's just luck because of my board or the fan though or both.

again it's the Asrock

which is interesting
and I'm sure it would work with about any fan as well

my Asus Z170 Formula format let me go down to 0
and I think that was the same on my Z67 sabertooth before that

a kinda cool Asrock feature
Edited by peter2k - 4/25/17 at 3:21am
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post #18 of 20
Quote:
Originally Posted by TheBloodEagle View Post

Just clarifying that I'm NOT using an adapter. I'm using the full RPM range with PWM signal. If I want this thing can ramp up to max RPM of 2000 RPM (although I never max out my system really, I never bench). It's stated as minimum RPM of 800 but I can show you 0 RPM showing on my HWinfo. As I mentioned, in this case, they have no problem going from 0 RPM to XXXX RPM and back to 0 RPM and doing it all again automatically.


Warning: Spoiler! (Click to show)







They're not fixed RPM unless you use an adaptor: http://www.coolermaster.com/cooling/case-fan/jetflo-120/



Tangent but about the LED and current flow, I know already and THAT'S exactly why I LOVE these fans. It's basically a design flaw because they changed that in newer models (CoolerMaster basically ended the JetFlo line and created the average MasterCase line) and every other LED fan out there with lights in the motor section offer full brightness at all times. These are the only fans that can basically act as an "activity" indicator for me. It's a huge plus to me when I have parts with LEDs and actually have a bit more to do than just bling/flashiness.


Also, I'm not saying one has to use these fans, it was just a suggestion and I'm just showing proof that indeed possible, at least PWM fans, can go from 0 RPM to XXXX RPM and back without problems.
It looks like a 700-2000rpm range not 0-2000rpm range. I'm guessing your motherboard turns off the power to fan below a certain speed / temperature, PWM fans use percentage PWM signal from source (motherboard / fan controller) and translate that percent PWM signal to their own individual PWM signal to rpm curve.
Here is graph showing how the fan's own internal PWM controller uses the motheboard / extranal percentage PWM signal to control fan speed. It is rather obvious that each fan has a different PWM signal % to RPM curve. Notice that each fan's PWM control has a minimum speed and that lowering the PWM signal % does not lower the fan speed below this minimum RPM. To stop the fan from spinning the 12v power on fan header pin-2 must to turned off.
post #19 of 20
Either way, I'm not complaining. Glad it works out this way to be honest. I was just showing that it is possible to reliably have the fan going off-on-off-on-off-on-off and doing so automatically without anything fancy (like a special temp probe based fan).
Edited by TheBloodEagle - 4/25/17 at 4:23am
post #20 of 20
Quote:
Originally Posted by TheBloodEagle View Post

Either way, I'm not complaining. Glad it works out this way to be honest. I was just showing that it is possible to reliably have the fan going off-on-off-on-off-on-off and doing so automatically without anything fancy (like a special temp probe based fan).
I was only explaining how this kind of control works on PWM fans and pointing out that while there are a few motherboards (like yours) that will turn fans off f below a certain temperature, most do not have this feature. wink.gif
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