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Do CLCs adjust fan/pump speed based on CPU or coolant temp ?

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What is the best way to get rid of those short CPU fan bursts but still be able to have your CPU cooling spin faster/slower depending on the temperature ? Just in a less aggresive way.
Let's say the PC is running just the browser and some basic apps,sitting at 30 degrees.When I launch some other software the cpu usage goes to +70% for a while and then drops.The fan spins up and then slows down again.
Same as while playing,for example Odyssey.You're running around and turn into the densely populated area,the usage spikes again,the fan spins up,then you leave the area,the fan spins down.

Shouldn't a cooler that regulates the pwm based on coolant temp better absorb those sudden temperature spikes ?

Setting the fans to silent mode does not solve it,I still want them to run in performance mode,just when I really need them (longer high load) not for short high loads.
 
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It depends on the cooler, pretty much all of them keep the pump speed constant, as there is no need to change it.
for the fans though, it depends where you have them plugged in, for example, corsair AIO's have an option in their software to either control fan speed as the coolant temp grows, or the the CPU itself, so it's up to you how you want to set them up. When I had my H100i I had a custom curve set up, so that the fans would spin up when CPU temps went up, but I wouldn't allow them to spin up to 100%
 
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I have mine synced with my gpu but I use icue. If that isn't an option doing it based on cpu coolant and setting up your own fan curve is the most ideal.
 

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I have my Motherboards "Smartfan" in the Bios control my AIO fans on PWM, works a treat, keeps the CPU cool and the fans are quiet, I must admit though in the past dependant on motherboard it has occasionally been hit and miss but my last 3 boards have all done the job well.
 
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Frankly I hate pretty much everything about CLCs but the fact they run on liquid is potentially a great solution for those short PWM spikes.
the coolant temp won't go up so steeply for short cpu temp spikes.

I first thought of this while watching a video on how clc testing procedure should include a warm-up time for the coolant to be objective

 
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For water cooled systems yes, the fan curve setup on the coolant is the way to go to avoid rpm spikes as possible
This may be variable depending the TIM used. High transfer heat rate TIM can and will produce some mild rpm spikes but not like air coolers.

For air coolers this is done by incerting a large delta/hysterisis for the fan curve but its not as good as water temp based curves. High rpm spikes still exist.
 
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Frankly I hate pretty much everything about CLCs but the fact they run on liquid is potentially a great solution for those short PWM spikes.
the coolant temp won't go up so steeply for short cpu temp spikes.

I first thought of this while watching a video on how clc testing procedure should include a warm-up time for the coolant to be objective


I agree for Rendering/heavy cpu usage apps but for gaming the coolant temp barely goes up its the reason I sync my fans with my gpu if not they will max at 600rpm. On smaller 240mm coolers this may not be the case though..... My biggest gripe with cooler testing in general is it's done on an open test bench which means results are nearly useless.
 
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thanks for all the answers
if I get this


can I set a custom fan curve for the coolant temps ?
 
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I agree for Rendering/heavy cpu usage apps but for gaming the coolant temp barely goes up its the reason I sync my fans with my gpu if not they will max at 600rpm. On smaller 240mm coolers this may not be the case though..... My biggest gripe with cooler testing in general is it's done on an open test bench which means results are nearly useless.
Yes this is true... Typically in a case the CPU cooling radiator is participating to the case's cooling (front intake or top exhaust). Setting the curve to GPU makes sense, but only in gaming scenarios. When running CPU intensive loads tho, without the participation of the GPU could be an issue...

thanks for all the answers
if I get this


can I set a custom fan curve for the coolant temps ?
As many as you like...

1578856828233.png
 
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what the other option under sensor ? cpu temp ?
 
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what the other option under sensor ? cpu temp ?

Pretty much everything you can even set it your your DDR4 temps, every motherboard temp, gpu, every single cpu core, and coolant.

Yes this is true... Typically in a case the CPU cooling radiator is participating to the case's cooling (front intake or top exhaust). Setting the curve to GPU makes sense, but only in gaming scenarios. When running CPU intensive loads tho, without the participation of the GPU could be an issue...


As many as you like...

View attachment 142051
I typically set it to a fixed 1500rpm for cpu intensive stuff.

thanks for all the answers
if I get this


can I set a custom fan curve for the coolant temps ?
They have a blacked out version of this coming out without the RGB fans for cheaper @cucker tarlson
 
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what the other option under sensor ? cpu temp ?
Yes its an option
In that dropdown menu there are all motherboard temps (but without names, just #1,#2,#3...) including CPU. Its the same order as HWiNFO see it.
HWiNFO_12_01_2020b.png

Other than that its whatever the system report as @oxrufiioxo says.
 
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what pump design does the 115i use ? asetek ?
 
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which one is better ?
 
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which one is better ?
I think in general the Platinum outperforms the Pro but because of the fans not the pump..
The Pro fans max out at 1200rpm vs 2000rpm on the Platinum. I'm betting with the same fans they would be nearly identical.
 
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TL DR

I don't play games... all my fans are on silent. The difference fans make from silent to ramped up isnt the difference of hitting TJmax or remotely worrisome temps in my case. I'll hit 90c(max) during stress tests, but less than 60c gaming... why spend the time? Silent all the way. :)
 
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TL:DR

I don't play games... all my fans are on silent. The difference fans make from silent to ramped up isnt the difference of hitting TJmax or remotely worrisome tempscincmy case. I'll hit 90c(max) during stress tests, but less than 60c gaming... why spend the time? Silent all the way. :)
ok boomer

I still want good performance when I'm playing,my oc tends to cause stability problems when temps go too high.
 
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TBH I just set the pump to run full speed, as you typically cannot hear them unless your head is in the case. Then set a fan curve, where I just run fans silent like ED mentioned.
 
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CLC just set everything according to water temp in the loop and you should be fine
 
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The only "premium" AIO I've had was the OG Corsair H100i and IIRC it had that possibility. All other AIOs which I've had have been generic Asetek ones and I've simply ran them at full speed, maybe I've been lucky but none had annoying pump noise at all.

I'd run by the coolant temp, since quick changes of CPU temps just ramps it lower and higher and IMO that's hella annoying, at least in fans. :D
 
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TBH I just set the pump to run full speed, as you typically cannot hear them unless your head is in the case. Then set a fan curve, where I just run fans silent like ED mentioned.
...and I dont even need to run the pump at full tilt either.. set to 1.5 gpm flow. After that is diminishing returns anyway (why more noise amd little heat dumping the loop is my thought). Even dumping 300w load through 3x120mm rad, all my settings are static. Running another 100 mhz isnt worth it to me for this ubiquitous silence. :)

But you should be able to set both the pump and fans at a static level without issue. Some software has hysterisis settings too. But if you dont want the yoyo effect, set it to the water like chloe said or go static. Easy breezy.
 

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This is one of the reasons I connect the fans to my motherboard instead of the CLC. Then I use the options in my motherboard to limit how fast the fan can change speed. All the motherboard I use have the option to wait 10 seconds inbetween changing fans speed, this greatly reduces noticeable fan spikes.
 
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