Am i setting up my AIO fans completely wrong?

wingnutta

wingnutta

wingnutta

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Spain - Finally....
OK, i have a 3900x with a H150 Pro XT on it. Running 6 fans in push pull on them in a stupidly large Thermaltake 900 case. Setting up my fan profiles through ICue have been ok, and im getting the fans to ramp up circa 65 degrees under load.. Thus under load my fans are working harder (bit noisy but nothing major)..

Now i read through this following thread here (hope its allowed to link):

https://forum.corsair.com/forums/showthread.php?t=192715

Basically the person is saying that i should be running the fans off the coolant temp as it is that i need to keep cool - the temps of the CPU are bound by the voltage? - and i dont control that with the cooler setup.

What they are saying kinda makes sense as if the coolant is kept circa at 30 degrees which it is at the moment - it will never get better than that, thus keeping it at that - will let my CPU run hotter but within limits??.. And the cooler is running at nigh on 100% efficiency ish.. Hope thats not too confusing..

TL:DR: Should i run my H150 fan profiles off the CPU temp (erratic with the 3900x) - or run them off the Coolant temp and only let the fans ramp up when the coolant gets warmer?? - This option means the fans will not ramp up as much?? (Never seen it past 34 degrees yet!)

I do feel like with a H150 it should cool the 3900x with ease??
 
The concept is that the fans cool the water, not the CPU. A short spike in CPU temperature related to voltage and loads, will not be instantly cooled by increasing fan speed. Instead the water would need to be already colder than needed/any extra heat is absorbed by the water.

Tracking fan speed to liquid temp makes for smoother fan curve behaviour because any short term changes in CPU temp up or down are spread out into a general change in liquid temperature over time. It does however make it harder to know what specific temperatures to aim for - liquid should never go above 60 degrees C, but how does that relate to CPU temp? If you want a maximum CPU temp of say 75°C, what liquid temp is that? Well, it depends on voltage and clock speed so will vary from chip to chip and clock settings.

So basically both will work - you may find one works better for you or is more convenient. Experimentation isn't a bad thing. You could, for instance, have fans increase speed if liquid goes over 30° or CPU goes over 65°.
 
Coolant temp, all you are doing by having them ramp up and down based on cpu temp is introduce massive variation in how loud the system is from one second to the next bases upon how quickly cpu temperature can fluctuate.
 
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