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.
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.
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.
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.
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.
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.
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:
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.
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?
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.
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
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.
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.
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.
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.
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.
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.
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.
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.
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).
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.
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